I have always been interested in auto-stalemates, but the possibilities of such chess problems are quite limited. It is necessary that White's last move must not be able to be made the same way back. In orthodox chess (if we only have white pieces on the board) this can only be achieved when the last move is a pawn move. Without pawns and without fairy conditions this can be achieved with e.g. Mao or Moa pieces (for example P1379418), but even here the possibilities are rather limited.
In May 2024, Sébastien Luce inspired me when in an e-mail he brought to my attention the Equistopper piece, which also has this property. I extended his original idea of using multiple of these same pieces to different combinations of material and discovered a lot of length records. In particular, when combined it with the ABC condition (Alphabétiques), the possibilities of such problems are associated with a number of different specific motifs that are used to achieve dual free solutions.
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ES01 Vaclav Kotesovec, original (dedicated to Sebastien Luce)
White QFa8f8d6a4b4a3a2a1h1
ser-!=50AlphabeticChess 9 non-stop equistoppers C+ |
1.QFa2-a5 2.QFa1-a2 3.QFa4-a6 4.QFa2-a4 5.QFa6-a7 6.QFa4-a6 7.QFa3-a4 8.QFb4-c5 9.QFa5-b5 10.QFa4-a5 {
} 11.QFa7-b6 12.QFa6-a7 13.QFa5-a6 14.QFb5-e3 15.QFb6-c6 16.QFa6-b6 17.QFa8-b7 18.QFb6-d7 19.QFa7-b6 20.QFb7-e4 {
} 21.QFc5-d4 22.QFb6-c5 23.QFc6-d5 24.QFd4-e6 25.QFc5-d4 26.QFd5-f3 27.QFd4-d5 28.QFd6-e7 29.QFd5-d6 30.QFd7-f4 {
} 31.QFd6-e5 32.QFf3-g2 33.QFe4-f3 34.QFe3-e4 35.QFf4-f6 36.QFe6-f4 37.QFe5-e6 38.QFe4-e5 39.QFf4-f5 40.QFe6-f4 {
} 41.QFe5-e6 42.QFf5-g3 43.QFe7-f5 44.QFf6-f7 45.QFf4-f6 46.QFe6-f4 47.QFf7-g4 48.QFf6-f7 49.QFf4-f6 50.QFf3-f4 {autopat}
This is an absolute record with 9 ES. My program VKComposer needed 317 CPU hours to explore all the possibilities! Testing of chess problems with ES is possible only with WinChloe or Popeye. Alybadix does not know this piece. However, due to the ABC condition, testing these problems is very fast, usually only a few seconds, a few minutes at most. |
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ES01B Vaclav Kotesovec, original
White QFa8f8d6a4b4a3a2a1
ser-!=21AlphabeticChess 9 non-stop equistoppers C+ |
Some may now think that ESh1 is redundant in the previous position. It is not! Without ESh1, the problem has a shorter solution in 21 moves, and it is surprising that this solution is unambiguous!
1.QFa2-a5 2.QFa1-a2 3.QFa4-a6 4.QFa2-a4 5.QFa6-a7 6.QFa4-a6 7.QFa3-a4 8.QFb4-c5 9.QFa5-b5 10.QFa4-a5 {
} 11.QFa7-b6 12.QFa6-a7 13.QFa5-a6 14.QFb6-c6 15.QFa6-b6 16.QFa8-b7 17.QFb6-d7 18.QFa7-b6 19.QFb7-c7 20.QFd6-e7 21.QFc5-d6 {autopat}
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ES02 Vaclav Kotesovec, original
White Kd1 QFa8a4h1
ser-!=25AlphabeticChess 3 non-stop equistoppers C+ |
1.QFa4-a6 2.QFa6-a7 3.Kd1-d2 4.Kd2-d3 5.Kd3-d4 6.Kd4-d5 7.Kd5-d6 8.Kd6-d7 9.Kd7-e8 10.QFa8-c8 {
} 11.QFc8-d8 12.Ke8-f7 13.Kf7-g8 14.Kg8-h8 15.QFd8-f8 16.QFf8-g8 17.Kh8-h7 18.QFh1-h4 19.Kh7-g7 20.QFa7-d7 {
} 21.Kg7-h8 22.QFh4-h6 23.QFh6-h7 24.QFd7-f7 25.QFf7-g7 {autopat}
A simple problem (Wenigsteiner), in which White's king has a clear path through the centre of the open chessboard, suprisingly unambigous. For example, if White were to move 4.Kc3, he would no longer be able to move the king, because (given the ABC condition) the move 5.ESa7-b5 would have to follow, etc. |
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ES03 Vaclav Kotesovec, original
White Kd1 QFa8a4h2b1
ser-!=43AlphabeticChess 4 non-stop equistoppers C+ |
1.QFa4-a6 2.QFa6-a7 3.QFb1-c1 4.QFa7-b4 5.QFb4-e3 6.QFc1-d2 7.Kd1-c1 8.Kc1-b2 9.Kb2-c3 10.Kc3-d4 {
} 11.QFd2-d3 12.Kd4-c3 13.Kc3-d2 14.Kd2-e1 15.Ke1-f2 16.Kf2-g3 17.QFe3-f3 18.QFd3-e3 19.Kg3-f4 20.Kf4-f5 {
} 21.QFf3-f4 22.QFf4-g3 23.QFe3-f3 24.QFf3-f4 25.Kf5-f6 26.QFf4-f5 27.Kf6-e7 28.Ke7-f8 29.Kf8-g8 30.QFa8-d8 {
} 31.Kg8-h8 32.QFd8-f8 33.QFf8-g8 34.QFh2-h5 35.QFf5-g5 36.QFg3-g4 37.QFg4-g6 38.QFg6-g7 39.QFg5-g6 40.Kh8-h7 {
} 41.QFh5-h6 42.Kh7-h8 43.QFh6-h7 {autopat}
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ES04 Vaclav Kotesovec, original
White Ka4 QFa8b3b2a1h1
ser-!=63AlphabeticChess 5 non-stop equistoppers C+ |
1.Ka4-a5 2.QFa1-a3 3.QFa3-a4 4.QFa4-a6 5.Ka5-a4 6.Ka4-a3 7.Ka3-a2 8.Ka2-b1 9.QFa6-a7 10.Kb1-a2 {
} 11.Ka2-a3 12.Ka3-a4 13.Ka4-a5 14.Ka5-a6 15.Ka6-b7 16.QFb3-b5 17.QFb5-e3 18.QFa7-c5 19.Kb7-c7 20.QFc5-d4 {
} 21.QFb2-c3 22.QFc3-d3 23.Kc7-d7 24.QFd3-d5 25.QFd5-f3 26.Kd7-e8 27.QFa8-c8 28.QFc8-d8 29.QFd4-d6 30.QFd6-d7 {
} 31.QFd7-e5 32.QFe3-e4 33.QFe4-e6 34.QFe6-e7 35.QFe5-e6 36.Ke8-d7 37.Kd7-d6 38.Kd6-e5 39.Ke5-f4 40.QFf3-g2 {
} 41.Kf4-g4 42.QFe6-f5 43.QFf5-g3 44.QFe7-f5 45.Kg4-g5 46.QFg3-g4 47.QFf5-g3 48.Kg5-g6 49.QFg4-g5 50.QFg2-g4 {
} 51.Kg6-g7 52.QFg5-g6 53.QFg3-g5 54.Kg7-h8 55.QFd8-f8 56.QFf8-g8 57.QFg6-g7 58.QFg4-g6 59.Kh8-h7 60.QFh1-h4 {
} 61.Kh7-h8 62.QFh4-h6 63.QFh6-h7 {autopat}
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ES05 Vaclav Kotesovec, original
White Ka4 QFb8d3a2b2a1h1
ser-!=67AlphabeticChess 6 non-stop equistoppers C+ |
1.QFa2-a3 2.QFa1-a2 3.Ka4-b5 4.Kb5-a6 5.QFa2-a4 6.QFa4-a5 7.QFa3-a4 8.Ka6-b5 9.Kb5-b4 10.QFb2-b3 {
} 11.QFb3-c3 12.Kb4-b5 13.QFa5-b4 14.QFb4-b6 15.Kb5-c6 16.QFa4-b5 17.QFb5-c4 18.QFb6-b7 19.QFb7-c5 20.Kc6-c7 {
} 21.QFc5-c6 22.QFc3-c5 23.Kc7-d8 24.QFb8-c8 25.QFc6-c7 26.QFc4-c6 27.QFd3-f2 28.Kd8-d7 29.Kd7-d6 30.Kd6-e5 {
} 31.QFc5-d5 32.QFc7-d6 33.QFc6-c7 34.QFd5-f3 35.QFd6-e4 36.QFc7-d6 37.Ke5-d5 38.Kd5-c6 39.Kc6-d7 40.Kd7-e7 {
} 41.Ke7-f7 42.QFf3-f5 43.QFf5-g3 44.Kf7-g8 45.QFc8-e8 46.QFe4-f6 47.QFd6-e6 48.QFe6-f7 49.QFe8-f8 50.QFf2-f5 {
} 51.QFf7-g4 52.QFf6-f7 53.QFf5-f6 54.QFg4-g6 55.QFf7-g4 56.QFf6-f7 57.QFg4-g5 58.QFf7-g4 59.QFg6-g7 60.QFg4-g6 {
} 61.QFg3-g4 62.Kg8-h7 63.QFh1-h4 64.Kh7-h8 65.QFf8-g8 66.QFh4-h6 67.QFh6-h7 {autopat}
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ES06 Vaclav Kotesovec, original
White Ka6 QFc8b7f5c4a2b2h1
ser-!=78AlphabeticChess 7 non-stop equistoppers C+ |
1.QFa2-a4 2.QFa4-a5 3.Ka6-b5 4.Kb5-a4 5.Ka4-b3 6.Kb3-c2 7.QFb7-e4 8.Kc2-b3 9.Kb3-a4 10.Ka4-b5 {
} 11.Kb5-a6 12.Ka6-a7 13.QFa5-a6 14.QFa6-b7 15.Ka7-b8 16.QFb2-b5 17.QFb5-b6 18.QFb7-d6 19.QFb6-b7 20.Kb8-a7 {
} 21.Ka7-b6 22.Kb6-c5 23.QFc4-c6 24.Kc5-d4 25.QFc6-c7 26.Kd4-e5 27.Ke5-f4 28.QFd6-e5 29.QFb7-d6 30.Kf4-f3 {
} 31.Kf3-g2 32.QFe4-f3 33.QFf3-f4 34.QFf5-g3 35.Kg2-h3 36.QFh1-h2 37.Kh3-g2 38.Kg2-f3 39.Kf3-e4 40.Ke4-d5 {
} 41.Kd5-c6 42.Kc6-d7 43.Kd7-e7 44.QFc7-d7 45.QFe5-e6 46.QFd6-e5 47.Ke7-f6 48.QFf4-f5 49.QFe5-f4 50.Kf6-g5 {
} 51.QFg3-g4 52.QFf4-g3 53.Kg5-h4 54.QFh2-h3 55.Kh4-g5 56.Kg5-f6 57.Kf6-e7 58.Ke7-f8 59.Kf8-g8 60.QFc8-e8 {
} 61.QFe6-f7 62.QFd7-e7 63.QFe8-f8 64.QFf5-f6 65.QFe7-f5 66.QFf7-g5 67.QFf6-f7 68.QFf5-f6 69.QFg4-g6 70.QFg3-g4 {
} 71.QFg6-g7 72.QFg4-g6 73.Kg8-h7 74.QFh3-h5 75.QFh5-h6 76.Kh7-h8 77.QFf8-g8 78.QFh6-h7 {autopat}
Positions after 36. and 54. move create a chameleon echo. |
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ES07 Vaclav Kotesovec, original
White Se1 QFe6a5a2c2h1
ser-!=51AlphabeticChess 5 non-stop equistoppers C+ |
1.QFa2-b2 2.QFa5-c3 3.QFc2-d4 4.QFc3-d2 5.QFb2-c3 6.QFd2-d3 7.QFc3-d2 8.QFd3-f2 9.QFd2-d3 10.QFd4-e3 {
} 11.Se1-f3 12.Sf3-e5 13.QFe3-e4 14.Se5-c4 15.Sc4-e3 16.Se3-g2 17.QFe4-e5 18.QFe6-f4 19.QFf2-f3 20.QFd3-e3 {
} 21.QFe3-e4 22.Sg2-e3 23.Se3-c4 24.Sc4-d6 25.Sd6-f7 26.QFf3-f5 27.QFf5-g3 28.Sf7-h6 29.QFf4-g5 30.QFe5-f4 {
} 31.QFg3-g4 32.Sh6-f5 33.Sf5-g3 34.Sg3-h5 35.QFh1-h3 36.QFh3-h4 37.Sh5-f6 38.QFf4-f5 39.QFe4-f4 40.Sf6-d7 {
} 41.Sd7-f8 42.QFf4-f6 43.QFf6-f7 44.QFf5-f6 45.Sf8-g6 46.Sg6-h8 47.QFf6-g7 48.QFg5-g6 49.QFg4-g5 50.QFh4-h6 51.QFh6-h7 {autopat}
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ES08 Vaclav Kotesovec, original
White Sd1 QFd3a2d2h2a1h1
ser-!=61AlphabeticChess 6 non-stop equistoppers C+ |
1.Sd1-b2 2.Sb2-a4 3.QFa2-a3 4.QFa1-a2 5.Sa4-b6 6.Sb6-a8 7.QFa2-a5 8.QFa3-a4 9.QFa4-a6 10.QFa6-a7 {
} 11.QFa5-a6 12.Sa8-b6 13.Sb6-a4 14.Sa4-b2 15.Sb2-d1 16.Sd1-f2 17.QFd2-e2 18.QFa6-c4 19.Sf2-d1 20.Sd1-b2 {
} 21.Sb2-a4 22.Sa4-b6 23.Sb6-c8 24.QFc4-c6 25.QFc6-c7 26.QFa7-b7 27.QFb7-e4 28.Sc8-b6 29.Sb6-c4 30.Sc4-d2 {
} 31.Sd2-f3 32.QFd3-e3 33.QFc7-d5 34.Sf3-d4 35.Sd4-f5 36.QFd5-e5 37.Sf5-d6 38.Sd6-e8 39.QFe4-e6 40.QFe2-e4 {
} 41.QFe6-e7 42.QFe4-e6 43.QFe3-e4 44.Se8-d6 45.Sd6-f7 46.Sf7-h8 47.QFh2-h5 48.QFh1-h3 49.QFh3-h4 50.QFh4-h6 {
} 51.QFh6-h7 52.QFh5-h6 53.Sh8-g6 54.QFe4-f5 55.QFe6-f6 56.QFe5-e6 57.Sg6-h8 58.QFf5-g6 59.QFf6-g7 60.QFe6-f6 61.QFe7-f7 {autopat}
The white knight's long path across the board. |
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ES09 Vaclav Kotesovec, original
White Sf2 QFa6h5a4a2b2a1h1
ser-!=63AlphabeticChess 7 non-stop equistoppers C+ |
1.QFa2-a3 2.QFa1-a2 3.QFa4-a5 4.QFa2-a4 5.QFb2-d2 6.QFd2-e2 7.QFa4-c3 8.QFa3-a4 9.QFa5-b4 10.QFa4-a5 {
} 11.QFa6-c4 12.QFb4-d3 13.QFa5-b4 14.QFd3-f4 15.QFb4-d3 16.Sf2-d1 17.Sd1-b2 18.Sb2-a4 19.Sa4-b6 20.Sb6-c8 {
} 21.QFc4-c6 22.QFc6-c7 23.QFc3-c5 24.QFc5-c6 25.QFc6-d4 26.Sc8-d6 27.QFd3-f2 28.QFd4-d5 29.QFd5-f3 30.Sd6-f5 {
} 31.QFf3-g4 32.QFe2-f3 33.QFf3-g2 34.QFf2-f3 35.Sf5-d4 36.Sd4-e6 37.Se6-f8 38.QFf4-f6 39.QFf6-f7 40.QFf3-f5 {
} 41.QFf5-f6 42.QFf7-g6 43.QFf6-f7 44.Sf8-d7 45.Sd7-e5 46.QFc7-d6 47.Se5-c6 48.Sc6-e7 49.Se7-g8 50.QFg2-g5 {
} 51.QFg6-g7 52.QFf7-g6 53.Sg8-e7 54.Se7-c6 55.Sc6-e5 56.Se5-f7 57.Sf7-h8 58.QFd6-f7 59.QFh1-h3 60.QFh3-h4 {
} 61.QFh4-h6 62.QFh6-h7 63.QFh5-h6 {autopat}
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ES10 Vaclav Kotesovec, original
White Rc2 QFb8f8b5c4a3g2
ser-!=59AlphabeticChess 6 non-stop equistoppers C+ |
1.QFb8-d8 2.Rc2-b2 3.Rb2-b4 4.Rb4-a4 5.Ra4-a8 6.Ra8-c8 7.QFc4-c6 8.QFc6-e4 9.Rc8-c2 10.Rc2-e2 {
} 11.QFd8-e8 12.Re2-d2 13.Rd2-d3 14.QFb5-c4 15.QFc4-d4 16.Rd3-b3 17.Rb3-b6 18.Rb6-d6 19.QFd4-d5 20.Rd6-c6 {
} 21.Rc6-c1 22.QFa3-b2 23.Rc1-c6 24.Rc6-e6 25.QFe4-e5 26.Re6-g6 27.QFe8-f5 28.QFg2-g4 29.QFg4-g5 30.Rg6-c6 {
} 31.Rc6-c2 32.Rc2-d2 33.QFb2-c2 34.Rd2-e2 35.QFc2-d2 36.Re2-e3 37.Re3-f3 38.QFd5-e4 39.Rf3-d3 40.Rd3-d4 {
} 41.QFd2-d3 42.Rd4-d6 43.Rd6-h6 44.QFf8-g7 45.QFe5-f6 46.QFf6-g6 47.Rh6-h8 48.Rh8-d8 49.Rd8-d7 50.QFd3-d5 {
} 51.QFd5-d6 52.Rd7-e7 53.Re7-e8 54.QFe4-e6 55.QFe6-e7 56.QFe7-f7 57.Re8-e6 58.Re6-f6 59.QFd6-e6 {autopat}
One would expect the white rook to be blocked in a corner of the board, but instead it ends up in the middle of the board. |
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ES11 Vaclav Kotesovec, original
White Rb7 QFc8a6c2a1b1d1f1
ser-!=65AlphabeticChess 7 non-stop equistoppers C+ |
1.QFa6-b4 2.QFb1-c1 3.QFa1-b1 4.Rb7-a7 5.Ra7-a3 6.Ra3-b3 7.QFb1-b2 8.Rb3-a3 9.Ra3-a7 10.Ra7-b7 {
} 11.QFb2-b3 12.QFb3-b5 13.QFb5-b6 14.QFb4-b5 15.QFb5-d3 16.Rb7-a7 17.Ra7-a3 18.Ra3-c3 19.QFc2-c5 20.QFc1-c2 {
} 21.Rc3-a3 22.Ra3-a7 23.Ra7-d7 24.QFd1-d4 25.QFd3-d5 26.QFd5-e3 27.Rd7-a7 28.Ra7-a4 29.Ra4-c4 30.QFc2-c3 {
} 31.QFc3-d3 32.Rc4-c2 33.Rc2-f2 34.QFd3-e2 35.QFc8-d5 36.Rf2-f3 37.QFd5-e4 38.QFf1-f2 39.Rf3-h3 40.Rh3-h1 {
} 41.Rh1-g1 42.Rg1-g2 43.QFe4-f3 44.Rg2-g1 45.Rg1-a1 46.Ra1-a7 47.Ra7-d7 48.Rd7-d5 49.Rd5-h5 50.QFf3-g4 {
} 51.QFe2-f3 52.Rh5-d5 53.Rd5-d7 54.Rd7-b7 55.Rb7-b8 56.QFb6-b7 57.QFb7-d5 58.Rb8-e8 59.QFd5-e4 60.QFe4-e6 {
} 61.QFe6-f5 62.Re8-e4 63.Re4-f4 64.QFd4-e4 65.QFc5-d4 {autopat}
As in the previous problem, there is a final stalemate position in the middle of the board. |
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ES12 Vaclav Kotesovec, original
White QFh8a6b3g2a1b1c1 WEa4
ser-!=113AlphabeticChess 7 non-stop equistoppers 1 wazir C+ |
1.WEa4-a3 2.QFa1-a2 3.QFa2-a4 4.WEa3-a2 5.WEa2-b2 6.QFa4-a5 7.QFa6-d4 8.WEb2-a2 9.WEa2-a3 10.WEa3-a4 {
} 11.WEa4-b4 12.QFb1-b2 13.QFb2-c3 14.WEb4-a4 15.WEa4-a3 16.WEa3-a2 17.WEa2-b2 18.QFa5-b4 19.WEb2-a2 20.WEa2-a3 {
} 21.WEa3-a4 22.WEa4-a5 23.WEa5-a6 24.WEa6-b6 25.QFb4-b5 26.QFb3-b4 27.QFb4-e6 28.WEb6-a6 29.WEa6-a7 30.WEa7-a8 {
} 31.WEa8-b8 32.WEb8-c8 33.QFc1-c2 34.QFc2-c5 35.QFc3-c4 36.QFc4-c6 37.QFc6-e4 38.WEc8-b8 39.WEb8-a8 40.WEa8-a7 {
} 41.WEa7-a6 42.WEa6-b6 43.WEb6-c6 44.WEc6-d6 45.QFd4-d5 46.WEd6-c6 47.WEc6-b6 48.WEb6-a6 49.WEa6-a7 50.WEa7-a8 {
} 51.WEa8-b8 52.WEb8-c8 53.WEc8-d8 54.WEd8-e8 55.QFe4-e5 56.QFe6-f4 57.WEe8-d8 58.WEd8-c8 59.WEc8-b8 60.WEb8-a8 {
} 61.WEa8-a7 62.WEa7-a6 63.WEa6-b6 64.WEb6-c6 65.WEc6-d6 66.WEd6-e6 67.WEe6-f6 68.QFf4-f5 69.WEf6-g6 70.QFg2-g4 {
} 71.QFg4-g5 72.WEg6-h6 73.WEh6-h5 74.WEh5-h4 75.WEh4-g4 76.WEg4-f4 77.WEf4-e4 78.WEe4-d4 79.WEd4-d3 80.QFb5-c4 {
} 81.WEd3-d2 82.WEd2-e2 83.QFc4-d3 84.QFd3-e4 85.WEe2-f2 86.WEf2-f3 87.WEf3-f4 88.WEf4-g4 89.QFe4-f4 90.QFf4-g6 {
} 91.WEg4-f4 92.WEf4-e4 93.WEe4-d4 94.WEd4-c4 95.WEc4-b4 96.WEb4-b5 97.WEb5-b6 98.WEb6-c6 99.WEc6-d6 100.WEd6-d7 {
}101.QFd5-d6 102.QFc5-d5 103.QFd6-f7 104.QFd5-d6 105.WEd7-d8 106.QFd6-d7 107.QFd7-e7 108.WEd8-d7 109.WEd7-d6 110.WEd6-e6 {
}111.WEe6-f6 112.QFe5-e6 113.QFh8-g7 {autopat}
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ES13 Vaclav Kotesovec, original
White Rd8 Sb1 QFf7a5a1d1
ser-!=60AlphabeticChess 4 non-stop equistoppers C+ |
1.QFa1-a3 2.QFa3-a4 3.Sb1-a3 4.Sa3-b5 5.Sb5-c7 6.QFa5-b6 7.Sc7-a6 8.QFa4-a5 9.Sa6-b8 10.QFb6-b7 {
} 11.QFb7-c4 12.Sb8-a6 13.Sa6-b4 14.Sb4-d3 15.QFd1-d2 16.QFd2-d5 17.Sd3-b4 18.Sb4-c2 19.Sc2-d4 20.Sd4-e6 {
} 21.Rd8-b8 22.Rb8-b3 23.Rb3-c3 24.QFa5-b4 25.Rc3-a3 26.Ra3-a6 27.Ra6-c6 28.QFc4-c5 29.Rc6-d6 30.Rd6-d7 {
} 31.QFd5-d6 32.Rd7-b7 33.Rb7-b6 34.QFb4-b5 35.Rb6-b8 36.Rb8-g8 37.Se6-d4 38.Sd4-c6 39.Sc6-e7 40.Se7-g6 {
} 41.Sg6-h8 42.Rg8-a8 43.Ra8-a1 44.Ra1-f1 45.QFb5-d3 46.QFd3-e2 47.Rf1-f5 48.Rf5-h5 49.QFf7-g6 50.QFd6-f7 {
} 51.QFe2-f4 52.Rh5-f5 53.Rf5-f6 54.QFf4-f5 55.Rf6-e6 56.Re6-e7 57.QFc5-d6 58.Re7-e6 59.Re6-f6 60.QFd6-e6 {autopat}
See ES19 for a similar problem with two solutions. |
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ES14 Vaclav Kotesovec, original
White Sh8b6 QFa8a4f4a2a1c1
ser-!=40AlphabeticChess 6 non-stop equistoppers C+ |
1.QFa1-b1 2.QFa2-a3 3.QFa3-b2 4.QFa4-a6 5.QFa6-a7 6.QFa7-b4 7.QFb2-e5 8.QFb4-d4 9.Sb6-a4 10.Sa4-b2 {
} 11.Sb2-d1 12.QFc1-d3 13.QFb1-c1 14.Sd1-b2 15.Sb2-a4 16.Sa4-b6 17.Sb6-c8 18.QFa8-b8 19.QFb8-e8 20.Sc8-a7 {
} 21.Sa7-c6 22.Sc6-d8 23.QFd4-d6 24.QFd6-f7 25.Sd8-b7 26.Sb7-d6 27.Sd6-e4 28.Se4-f6 29.QFf4-g6 30.Sf6-e4 {
} 31.Se4-f2 32.Sf2-h1 33.QFd3-f2 34.QFc1-d3 35.QFf2-g5 36.QFd3-f2 37.QFe5-f5 38.QFf5-g3 39.QFf7-g4 40.QFe8-f7 {autopat}
Interestingly, there does not exist a stalemate position with 4 ES + 2 knights and even with 5 ES + 2 knights, 6 ES is necessary! |
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ES15 Vaclav Kotesovec, original
White Ka2 Rg7e3 QFc8d1h1
ser-!=46AlphabeticChess 3 non-stop equistoppers C+ |
1.Ka2-b3 2.Kb3-c4 3.Kc4-d5 4.QFd1-d3 5.QFd3-d4 6.Kd5-e5 7.Re3-f3 8.Ke5-f5 9.Rf3-f2 10.QFd4-e3 {
} 11.Rf2-d2 12.Rd2-d8 13.Rd8-e8 14.QFc8-d8 15.Re8-e7 16.QFe3-e5 17.QFe5-e6 18.Re7-f7 19.Kf5-f4 20.Kf4-g3 {
} 21.Rf7-f5 22.Rf5-h5 23.Kg3-h3 24.Rg7-f7 25.Rf7-f8 26.QFd8-e8 27.QFe6-e7 28.Rf8-f7 29.Rf7-h7 30.QFh1-h2 {
} 31.Kh3-h4 32.QFh2-h3 33.Kh4-g5 34.QFe7-f6 35.Kg5-f5 36.Kf5-e6 37.Ke6-f7 38.Kf7-g7 39.Kg7-h8 40.QFf6-g7 {
} 41.QFh3-h4 42.QFh4-h6 43.Rh5-f5 44.Rf5-f8 45.Rf8-g8 46.QFe8-f8 {autopat}
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ES16 Vaclav Kotesovec, original
White Rg6a3a2 QFa8b2h2
ser-!=34AlphabeticChess 3 non-stop equistoppers C+ |
1.Ra2-a1 2.Ra1-b1 3.Ra3-a7 4.Ra7-d7 5.Rb1-a1 6.Ra1-a6 7.Ra6-b6 8.QFb2-b4 9.QFb4-e3 10.Rb6-b8 {
} 11.Rb8-e8 12.QFa8-c8 13.QFc8-d8 14.Rd7-d5 15.Rd5-f5 16.Re8-e5 17.QFe3-e4 18.Re5-e7 19.Re7-g7 20.Rf5-f8 {
} 21.QFd8-e8 22.QFe4-e6 23.QFe6-e7 24.QFe7-f7 25.Rf8-h8 26.Rg6-h6 27.Rg7-h7 28.QFf7-g7 29.QFh2-h5 30.Rh6-f6 {
} 31.Rf6-f8 32.Rf8-g8 33.QFe8-f8 34.QFh5-h6 {autopat}
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ES17 Vaclav Kotesovec, original
White Kf1 Sb1 QFd8a4a2h2a1
ser-!=74AlphabeticChess 5 non-stop equistoppers C+ |
1.QFa2-a3 2.QFa1-a2 3.Sb1-d2 4.Sd2-b3 5.Sb3-d4 6.Sd4-b5 7.Sb5-a7 8.QFa3-a5 9.QFa2-a3 10.QFa5-a6 {
} 11.QFa3-a5 12.Sa7-b5 13.Sb5-d4 14.Sd4-b3 15.Sb3-c1 16.QFa5-b3 17.QFa4-a5 18.QFb3-d2 19.QFa5-b3 20.Sc1-a2 {
} 21.Sa2-c3 22.Sc3-a4 23.Sa4-c5 24.Sc5-b7 25.QFb3-b5 26.QFb5-b6 27.QFb6-c7 28.Sb7-c5 29.Sc5-d7 30.QFd2-f2 {
} 31.Sd7-f8 32.QFd8-e8 33.Kf1-e2 34.QFa6-c4 35.QFc4-d6 36.QFd6-e4 37.Ke2-e3 38.QFc7-d5 39.Ke3-d4 40.Kd4-c5 {
} 41.Kc5-d6 42.Kd6-e6 43.QFe4-e5 44.Ke6-f6 45.QFf2-f5 46.Kf6-g5 47.Sf8-e6 48.Se6-c5 49.Sc5-e4 50.Se4-f6 {
} 51.Sf6-g8 52.QFe8-f8 53.Kg5-h5 54.QFf5-g5 55.QFd5-f5 56.Sg8-f6 57.Sf6-d5 58.Sd5-f4 59.Sf4-g6 60.Sg6-h8 {
} 61.QFf8-g8 62.Kh5-g6 63.Kg6-f6 64.Kf6-e7 65.QFe5-e6 66.QFe6-f7 67.Ke7-f6 68.Kf6-g6 69.QFf5-f6 70.QFf6-g7 {
} 71.Kg6-h7 72.QFg5-g6 73.QFh2-h5 74.QFh5-h6 {autopat}
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ES18 Vaclav Kotesovec, original
White Ka2 Rb1 Sc6 QFd8a6h5a1
ser-!=67AlphabeticChess 4 non-stop equistoppers C+ |
1.Ka2-b3 2.QFa6-b6 3.Rb1-b2 4.Rb2-a2 5.Ra2-a4 6.Ra4-b4 7.Kb3-a4 8.Ka4-b5 9.Rb4-a4 10.Ra4-a7 {
} 11.QFa1-a4 12.Ra7-c7 13.Kb5-a6 14.QFa4-a5 15.Ka6-b5 16.Kb5-c4 17.Kc4-d3 18.Sc6-b4 19.Sb4-d5 20.Rc7-a7 {
} 21.QFa5-a6 22.Ra7-a8 23.QFa6-a7 24.Ra8-b8 25.QFb6-b7 26.QFb7-c6 27.Rb8-b1 28.Rb1-c1 29.QFa7-b4 30.Rc1-f1 {
} 31.Kd3-c4 32.Kc4-b5 33.Kb5-a6 34.Ka6-b7 35.Kb7-c7 36.Kc7-d7 37.Sd5-e3 38.Kd7-e7 39.Se3-f5 40.Ke7-f7 {
} 41.Rf1-f3 42.Rf3-h3 43.Sf5-g3 44.Kf7-g7 45.Sg3-h1 46.Kg7-h7 47.Sh1-g3 48.Sg3-f5 49.Sf5-e7 50.Se7-g8 {
} 51.QFc6-e7 52.QFb4-c6 53.Sg8-f6 54.Sf6-d7 55.Sd7-e5 56.Se5-f7 57.Sf7-h8 58.QFd8-f8 59.QFf8-g8 60.Rh3-f3 {
} 61.Rf3-f7 62.Rf7-g7 63.QFe7-f7 64.QFc6-e7 65.QFf7-g6 66.QFe7-f7 67.QFh5-h6 {autopat}
This problem was the only one that was a bit more challenging to test. WinChloe took 4 hours 34 minutes and Popeye took 1 hour 41 minutes. |
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ES19 Vaclav Kotesovec, original
White Rf8 Sb1 QFd7e6f5a1
ser-!=124 non-stop equistoppers 2 solutions C+ |
1.Rf8-e8 2.QFe6-e7 3.QFe7-c4 4.Re8-e3 5.QFa1-c2 6.Re3-c3 7.QFf5-d3 8.Sb1-d2 9.Sd2-b3 10.QFd7-c5 11.Sb3-a1 12.QFc5-b3 {autopat}
1.Sb1-c3 2.QFa1-b2 3.Sc3-e2 4.QFe6-e4 5.QFe4-e3 6.Se2-g3 7.Sg3-h1 8.QFf5-g3 9.Rf8-f3 10.QFd7-f4 11.QFb2-d3 12.QFd3-f2 {autopat}
A chameleon echo in two corners of the chessboard. The attentive reader will not have missed the fact that this problem is without the ABC condition. Unfortunately, the possibilities of such positions are rather limited and the length records much shorter than with the ABC condition (compare with ES13). Moreover, for problems with one solution, the play is usually less interesting. |
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ES20 Vaclav Kotesovec, original
White Ra1 QFb6b4a3c2
ser-!=21AlphabeticChess 4 non-stop equistoppers 4 solutions C+ |
1.Ra1-d1 2.QFb4-b5 3.QFb5-c3 4.QFa3-b3 5.Rd1-e1 6.QFc3-d2 7.QFb6-c4 8.QFc2-c3 9.Re1-e7 10.QFc3-d5 {
} 11.Re7-e1 12.Re1-f1 13.QFd5-e3 14.Rf1-a1 15.Ra1-a6 16.Ra6-c6 17.QFc4-c5 18.QFc5-d4 19.Rc6-c3 20.Rc3-d3 21.QFb3-c3 {autopat}
1.Ra1-e1 2.QFb4-b5 3.Re1-b1 4.Rb1-b4 5.Rb4-a4 6.Ra4-a8 7.Ra8-d8 8.QFb6-c7 9.Rd8-f8 10.Rf8-f7 {
} 11.QFb5-d6 12.QFa3-b5 13.Rf7-f4 14.QFd6-e5 15.QFc7-d6 16.Rf4-c4 17.QFc2-c3 18.QFc3-d4 19.Rc4-c5 20.Rc5-d5 21.QFb5-c5 {autopat}
1.Ra1-g1 2.QFa3-d2 3.QFb4-c3 4.QFb6-c4 5.QFc3-e2 6.QFc2-c3 7.QFc4-d3 8.Rg1-g6 9.QFe2-f4 10.QFd2-e3 {
} 11.Rg6-c6 12.Rc6-c5 13.QFc3-c4 14.Rc5-c7 15.Rc7-d7 16.QFd3-d5 17.QFd5-d6 18.QFd6-e5 19.Rd7-d4 20.Rd4-e4 21.QFc4-d4 {autopat}
1.Ra1-h1 2.QFb4-b5 3.QFb5-e3 4.QFa3-c3 5.QFc3-d3 6.QFd3-f2 7.QFb6-d4 8.Rh1-h4 9.QFd4-f4 10.QFf2-f3 {
} 11.QFf4-g4 12.Rh4-h6 13.Rh6-e6 14.QFc2-d4 15.Re6-e7 16.QFe3-e5 17.QFe5-e6 18.QFe6-f5 19.Re7-e4 20.Re4-f4 21.QFd4-e4 {autopat}
Quadruple echo with final stalemate positions in the middle of the chessboard. But I regret the repetitive second move of White, so I am publishing the problem only in the article and not sending it to a competition. |