In the below position, taken from the end of the game McDonnell-Bourdonnais, black must win. Is there a way that white can survive for six moves?

I only know some ways that white can survive for five moves as follows.

3b2rk/3P2pp/8/p7/8/2Q5/PP1pppPP/3R3K w - - 0 1

1. h4                         exd1=Q+
2. Kh2                        f1=Q
3. Qc4                        Qfxc4 
4. g4                         Qcxg4
5. a3                         Qdxg1#

The White pawn must move to give the space for the king, since the queen and rook cannot prevent the black pawns from promoting to queens. Because of the Bishop on e4, white queen must defend h4. She can go b4, c4, d4, h3, f6 or g7. But it seems that nothing works.

  • 1
    which game is this from? – prusswan Dec 22 '17 at 18:38
  • @prusswan Emmm, actually the game is an action-adventure video game published by Ubisoft named Watchdog, and this comes from Watchdog1. In this game, you can play chess with AI (both endgame or whole game). Indeed chess is a small part of Watchdog. – TeamBright Dec 31 '17 at 6:28
  • 4
    While it's true this is from the game Watchdog - they actually took this position from a famous game played in 1834 between McDonell and La Bourdonnais: chessgames.com/perl/chessgame?gid=1001165 – NoseKnowsAll Jan 28 at 0:13

No. According to my Stockfish, this is a forced mate in 5, whatever White tries to prevent it, and you're giving one of the (relatively) best lines. Black threatens a back rank mate by promoting one of his pawns, and the rook and queen cannot stop that. Moving the g-pawn doesn't really help, so 1. h3 and 1. h4 are the best tries.

3b2rk/3P2pp/8/p7/8/2Q5/PP1pppPP/3R3K w - - 0 1

1. h4 (1. Qxd2 f1=Q+ 2. Rxf1 exf1=Q#) (1. h3 exd1=Q+ 2. Kh2 Bh4 { threatens Qg1# } 3. Qc1 Qxc1 4. a3 Qg1#) exd1=Q+ 2. Kh2 f1=Q 3. Qd4 ( 3. Qc4 Qxc4 4. g4 Qcxg4 5. a3 Qdg1# ) Bc7+ 4. Qf4  Bxf4+ 5. Kh3 Qh1#
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  • Thanks, I saw it in a RPG game, and the answer says "6", so it makes me confused. Maybe the answer is wrong. – TeamBright Dec 16 '17 at 12:17
  • You could post the relevant lines to make this answer more complete. – GloriaVictis Dec 16 '17 at 16:41
  • @GloriaVictis done. – Glorfindel Dec 16 '17 at 22:15

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