Chess beauty and sadeness at the same time.

[Lazy_Frank]

[fen]3bnKn1/r2pRpRp/1BN2N2/p2QpB2/1ppqbrp1/PPPPPPPP/8/7k w
[/fen]

All pieces on board, white has in total 65 moves, 50 of them is capture, still draw due to pawn wall.

[Ajedrecista]

Hello:

[fen]3bnKn1/r2pRpRp/1BN2N2/p2QpB2/1ppqbrp1/PPPPPPPP/8/7k w
[/fen]

All pieces on board, white has in total 65 moves, 50 of them is capture, still draw due to pawn wall.

I am curious to see how the white rooks got there...

I computed perft for some plies: from 1 to 7 with JetChess 1.0.0.0 and gperft 1.1 perft counters, then perft(8) only with gperft 1.1:

Code: Select all

3bnKn1/r2pRpRp/1BN2N2/p2QpB2/1ppqbrp1/PPPPPPPP/8/7k w - - 0 1

perft(1) =                 65
perft(2) =              2,574
perft(3) =            146,964
perft(4) =          5,818,534
perft(5) =        304,150,184
perft(6) =     12,091,652,506
perft(7) =    589,020,446,537
perft(8) = 23,546,433,573,249

I also counted unique positions with JetChess 1.0.0.0:

Code: Select all

3bnKn1/r2pRpRp/1BN2N2/p2QpB2/1ppqbrp1/PPPPPPPP/8/7k w - - 0 1

positions(1) =          65
positions(2) =       2,574
positions(3) =      86,278
positions(4) =   2,047,077
positions(5) =  45,568,535
positions(6) = 812,674,411

Regards from Spain.

Ajedrecista.

[Uri Blass]

[fen]3bnKn1/r2pRpRp/1BN2N2/p2QpB2/1ppqbrp1/PPPPPPPP/8/7k w
[/fen]

All pieces on board, white has in total 65 moves, 50 of them is capture, still draw due to pawn wall.

Did you prove that it is a draw?

evaluation of engines prove nothing.

Stockfish give initially big advantage for white but the evaluation goes down.

[Lazy_Frank]

Hello:

[fen]3bnKn1/r2pRpRp/1BN2N2/p2QpB2/1ppqbrp1/PPPPPPPP/8/7k w
[/fen]

All pieces on board, white has in total 65 moves, 50 of them is capture, still draw due to pawn wall.

I am curious to see how the white rooks got there...

I computed perft for some plies: from 1 to 7 with JetChess 1.0.0.0 and gperft 1.1 perft counters, then perft(8) only with gperft 1.1:

Code: Select all

3bnKn1/r2pRpRp/1BN2N2/p2QpB2/1ppqbrp1/PPPPPPPP/8/7k w - - 0 1

perft(1) =                 65
perft(2) =              2,574
perft(3) =            146,964
perft(4) =          5,818,534
perft(5) =        304,150,184
perft(6) =     12,091,652,506
perft(7) =    589,020,446,537
perft(8) = 23,546,433,573,249

I also counted unique positions with JetChess 1.0.0.0:

Code: Select all

3bnKn1/r2pRpRp/1BN2N2/p2QpB2/1ppqbrp1/PPPPPPPP/8/7k w - - 0 1

positions(1) =          65
positions(2) =       2,574
positions(3) =      86,278
positions(4) =   2,047,077
positions(5) =  45,568,535
positions(6) = 812,674,411

Regards from Spain.

Ajedrecista.

Position supposed to be legal. Build a moves history will be challenge.

[CMCanavessi]

Position might be "legal" (that is, it doesn't violate any chess rule) but it is impossible to get to that position playing from standard start position.

[Uri Blass]

Position is illegal because with no captures the white rooks has no way to go above rank 2

[Uri Blass]

Best is Re7xe8 based on stockfish when other move lose more than 4 pawns.
Gravitation works against white and the score tend to be lower for white if you search deeper so I am not sure if Re7xe8 is enough for a draw.

Copied analysis from arena that show the moves when I copy them in the wrong order,
FEN: 3bnKn1/r2pRpRp/1BN2N2/p2QpB2/1ppqbrp1/PPPPPPPP/8/7k w - - 0 1

Stockfish_22062008_x64_avx2:

34/53 5:19:10 106,859,338k 5,580k -6.52 Bb6xd4 Bd8xe7+ Nc6xe7 Be4xd5 Bd4xa7 Ne8xg7 c3xb4 Rf4xf5 b3xc4 Ng8xf6 f3xg4 Ng7-e6+ Kf8xf7 Ne6-g5+ Kf7-f8 Rf5-f1 c4xd5 a5xb4 a3xb4 Nf6xd5+ Ne7-f5 Nd5xb4 h3-h4 Rf1-a1 Ba7-b8 Ng5-e6+ Kf8-f7 Nb4xd3 Bb8-d6 Kh1-g2 Kf7-g8 Nd3-f2 g4-g5 Nf2-e4 Bd6-e7 Ne4xg3 e3-e4 d7-d5 Nf5xg3 d5-d4 Ng3-f5 Kg2-f3 Kg8xh7 d4-d3 Be7-b4 Kf3xe4 Nf5-d6+ Ke4-d5 g5-g6
34/54 5:19:10 106,859,338k 5,580k -6.26 d3xc4 Be4xd5 c3xd4 Bd8xe7+ Nc6xe7 Ne8xg7 f3xg4 Ng7xf5 Bb6xa7 Ng8xe7 a3xb4 Ne7-g6+ Kf8-g8 Nf5-e7+ Kg8-g7 Rf4xf6 Kg7xf6 Bd5xc4 b4xa5 Bc4xb3 h3-h4 Ne7-c6 Ba7-b6 Kh1-g2 h4-h5 Ng6-e7 g4-g5 e5xd4 e3xd4 Kg2xg3 Bb6-c5 Ne7-d5+ Kf6xf7 Nd5-f4+ Kf7-g7 Nf4xh5+ Kg7xh7 Nc6xa5 g5-g6 Kg3-f3 g6-g7 Nh5-f6+ Kh7-g6 Nf6-g8
34/48 5:19:10 106,859,338k 5,580k -6.02 f3xe4 Bd8xe7+ Nc6xe7 Qd4xd5 Nf6xd5 Ne8xg7 Bb6xa7 b4xa3 e3xf4 Ng7xf5 Ne7xg8 c4xb3 e4xf5 b3-b2 Kf8xf7 b2-b1Q f5-f6 a3-a2 Kf7-g7 Qb1-b7 f6-f7 a2-a1Q f7-f8Q Qb7xd5 h3xg4 Qa1xc3 Qf8-f6 Qd5-b7 Ba7-b6 d7-d6+ Ng8-e7 Qb7xb6 g4-g5 a5-a4 Kg7xh7 Qb6-d4 f4-f5 Qc3xd3 g5-g6 Qd3xg3 g6-g7
34/55 5:19:10 106,859,338k 5,580k -5.75 Bb6xa7 Qd4xd5 Nf6xd5 Ne8xg7 g3xf4 Bd8xe7+ Nc6xe7 Ng7xf5 c3xb4 Nf5xe7 f3xg4 c4xb3 Nd5-c3 Be4xd3 Nc3-d1 e5xf4 e3xf4 a5xb4 a3xb4 Kh1-g2 Ba7-d4 Ne7-c6 Bd4-b2 Ng8-h6 Bb2-a3 Bd3-c2 Nd1-c3 Kg2xh3 g4-g5 Nh6-f5 b4-b5 Nc6-a5 b5-b6 Nf5-e3 Ba3-c1 Ne3-c4 Nc3-a4 b3-b2 Bc1xb2 Bc2xa4 f4-f5 Nc4xb2 Kf8xf7 Kh3-g4
34/62 5:19:10 106,859,338k 5,580k -5.66 Re7xe5 Be4xd5 e3xd4 Rf4xf5 Re5-e1+ Kh1-g2 Nf6xd5 Ne8xg7 Bb6xa7 c4xb3 Nc6-e5 Ng7-e6+ Kf8xg8 Rf5-g5+ Kg8-h8 g4xf3 c3xb4 f3-f2 Re1-e2 f7-f5 Nd5-e3+ Kg2xg3 Ne5xd7 Kg3-f3 Re2xf2+ Kf3xf2 d4-d5 Ne6-f4 Ne3-c4+ Kf2-e2 d5-d6 a5xb4 a3xb4 Nf4-e6 d3-d4 f5-f4 h3-h4 Rg5-g7 d4-d5 Rg7xd7 d5xe6 Bd8-f6+ Kh8-g8 Rd7xa7
34/61 5:19:10 106,859,338k 5,580k -5.46 c3xd4 Bd8xe7+ Nc6xe7 Be4xd5 Nf6xe8 Ng8xe7 h3xg4 c4xb3 Kf8xe7 Rf4xf5 g4xf5 b4xa3 Bb6xa7 a3-a2 Ne8-f6 b3-b2 d4xe5 a2-a1Q Nf6xd5 b2-b1Q Ba7-d4 Qa1-a3+ Ke7xf7 Kh1-g2 Nd5-f4+ Kg2xf3 Rg7xh7 Qb1-b3+ Kf7-g6 Qa3-f8 f5-f6 Qf8-g8+ Rh7-g7 Qb3-f7+ Kg6-g5 Qf7xg7+ f6xg7 Qg8xg7+ Nf4-g6 Qg7-g8 Kg5-f6 Kf3xg3 Ng6-f4 Qg8-f8+ Kf6-g5 Qf8-f7 Bd4-c5
34/56 5:19:10 106,859,338k 5,580k -4.80 Bf5xe4 Qd4xd5 Nf6xd5 Bd8xe7+ Kf8xe8 Rf4xe4 Bb6xa7 d7xc6 h3xg4 c4xd3 a3xb4 c6xd5 b4xa5 d3-d2 f3xe4 d2-d1Q Rg7xg8 Be7-d6 Ke8-d7 d5xe4 Kd7-c6 Bd6-e7 Ba7-b6 Qd1-d6+ Kc6-b7 Qd6-d5+ Kb7-a7 Qd5-d7+ Ka7-a6 Qd7-c6 b3-b4 Qc6xc3 b4-b5 Qc3-d3 Rg8-c8 Be7-b4 g4-g5 Bb4-d2 Rc8-c7 Kh1-g2
34/55 5:19:10 106,859,338k 5,580k -4.48 e3xd4 Bd8xe7+ Nc6xe7 Be4xd5 Nf6xe8 Ng8xe7 h3xg4 Rf4xf5 b3xc4 Rf5xf3 Rg7xh7+ Kh1-g2 c3xb4 a5xb4 a3xb4 Ne7-g6+ Kf8-g7 Ra7-b7 Bb6-c5 Bd5-e6 d4-d5 Be6xg4 Rh7-h6 Rf3xg3 Ne8-d6 Rb7-b8 b4-b5 Ng6-f4 Bc5-a7 Nf4-h5+ Rh6xh5 Bg4xh5+ Kg7-f6 Rb8-g8 b5-b6 Rg3xd3 b6-b7 Rd3-b3 Kf6xe5 Bh5-e2 c4-c5 Be2-f3 c5-c6 d7xc6 d5xc6 Bf3xc6 b7-b8Q Rg8xb8 Ba7xb8
34/51 5:19:10 106,859,338k 5,580k -4.25 Qd5xd4 Bd8xe7+ Nc6xe7 e5xd4 Nf6xe8 Ng8xe7 f3xe4 Ne7xf5 e4xf5 Rf4-f3 c3xb4 d4xe3 Bb6xa7 e3-e2 b3xc4 g4xh3 Ba7-b8 e2-e1Q b4-b5 Kh1-g2 g3-g4 Rf3-e3 Ne8-f6 Qe1-a1 Rg7xf7 Qa1xa3+ Kf8-g7 Qa3xd3 b5-b6 Qd3xc4 Rf7xd7 h3-h2 Bb8xh2 Kg2xh2
34/52 5:19:10 106,859,338k 5,580k -0.40 Re7xe8 Be4xd5 Nc6xd4 Rf4xf5 Nf6xd5 e5xd4 Bb6xa7 c4xd3 Nd5-f4 d3-d2 h3xg4 Rf5xf4 e3xf4 d2-d1Q c3xb4 a5xb4 a3xb4 Bd8-e7+ Kf8xg8 Be7xb4 Rg7xf7 d4-d3 Rf7xh7+ Kh1-g2 Rh7xd7 Qd1xb3+ Kg8-h7 d3-d2 Re8-d8 Qb3xf3 f4-f5 Qf3xg4 Rd7xd2+ Bb4xd2 Rd8xd2+ Kg2-h3 Rd2-f2 Qg4-a4 Ba7-e3 Qa4-d7+ Kh7-h6 Qd7-d6+ f5-f6 Qd6xg3