The following position appeared to drive even modern engines crazy!

[FEN "8/8/b1kP2p1/P5P1/8/BK6/8/8 b - - 0 1"]

BLACK to move will get the following results: Komodo 24.1 64-bit depth 61= 3.46 Stockfish 14 depth 54= 1.12 Stockfish 6 depth =81 1.97 I ask the following position to be passed on TalkChess.com to see whathappens with perfect play.

  • 3
    Handwaving: Draw. White can only make progress by exchanging a6 against g6, and the resulting position is a Syzygy draw (if Black doesn't try the pseudoactive Ke6 - his Majesty belongs to e8, thus wait with K-d7-e8-d7 when the bishop must stay on d3). Sep 20 '21 at 19:18
  • 1
    Doesn't 1...b2 and 2...b1Q win for Black?
    – bof
    Sep 21 '21 at 1:13
  • 2
    Wait a minute, is your diagram upside down? If so please fix it.
    – bof
    Sep 21 '21 at 1:14
  • 1. Where is this position from ? If it was reached in a game, please reference it. 2. Can you translate the computer evaluations into something more understandable ? Do you your engines believe this is a draw or a loss for Black ? 3. Anyway, this is an endgame for Human analysis, not for software oracles, can you tell us what plans you have considered ?
    – Evargalo
    Sep 21 '21 at 6:33
  • 1
    What does "I ask the following position to be passed on TalkChess.com" mean? Sep 21 '21 at 9:03

Here is an attempt to justify "Draw". What should be the plans for White? Obviously wander with the king to...

  • Force entry to f6. This would win by zugzwang after some manouvering (play B to c7 and K to f7, the bB gets "scissored").
  • Force entry to c7. The d pawn queens (or the a).
  • Force entry to b8. The a pawn queens.

Unfortunately for White, the board is a line too short on either side. Black's correct plan for defense is playing the K to e6 immediately and the B to the long diagonal. Then, always block an eventual Kd4 with Ke6, Kb6 with Kd7 and Ka7 with Kc8. Laugh about the a-pawn running to a7, the B will control a8.

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