Let's discuss this: lichess.org/study/p1ZIITIK/yx4La4Po
The endgame tablebase labels 39.Nd7+ as "Win or 50 moves by prior mistake". What does this mean?
The endgame tablebase labels 39.Nd7+ as "Win or 50 moves by prior mistake". What does this mean?
Ganan las blancas
The variant you posted is a draw, since there were 50 moves without takeing a piece or moving a pawn. And that's exactly the Masssage:
After 39. Nd7+ the position is won but because you made a mistake prior it is a draw according to the 50 moves rule.
After 39. Nd7+ the position is won but because you made a mistake prior it is a draw according to the 50 moves rule.
Not sure what all that means...but you let him escape. The enemy king has to be lured to a corner square the same as your bishop; thus 39 Bh3 (for example) is mate in 4: 39... Ka8 40 Bg4 Kb8 41 Na6+ Ka8 42 Bf3.
39 Na6+ looks stronger @ISaveChesspapers
Yeah, good point. Not sure why I was going through the trouble of losing a move when there was just a mate in 2. :)
Don't know much about tablebase, but I think that the win is prevented according to 50 move rule by playing 39.Nd7+.
@MrPushwood said in #4:
> Not sure what all that means...but you let him escape. The enemy king has to be lured to a corner square the same as your bishop; thus 39 Bh3 (for example) is mate in 4: 39... Ka8 40 Bg4 Kb8 41 Na6+ Ka8 42 Bf3.
To clarify, I know how to do this checkmate. This is just an example game I put together in order to ask this question.
> Not sure what all that means...but you let him escape. The enemy king has to be lured to a corner square the same as your bishop; thus 39 Bh3 (for example) is mate in 4: 39... Ka8 40 Bg4 Kb8 41 Na6+ Ka8 42 Bf3.
To clarify, I know how to do this checkmate. This is just an example game I put together in order to ask this question.
@ISaveChesspapers said in #1:
> The endgame tablebase labels 39.Nd7+ as "Win or 50 moves by prior mistake". What does this mean?
That is a good question - as you clearly intended not about how to win the position but how to interpret the Lichess endgame tablebase output. I don't think it's self-explanatory at all and nobody gave a good answer so far. The point is that after Black's 38th move, the tablebase lists 6 other White moves under the heading "Win prevented by 50-move rule". So what is special about only 39. Nd7+ that it gets the different heading "Win or 50 moves by prior mistake"? With the other six moves, you also made at least one prior mistake if the game is drawn by the 50-move-rule, otherwise this endgame is obviously won.
> The endgame tablebase labels 39.Nd7+ as "Win or 50 moves by prior mistake". What does this mean?
That is a good question - as you clearly intended not about how to win the position but how to interpret the Lichess endgame tablebase output. I don't think it's self-explanatory at all and nobody gave a good answer so far. The point is that after Black's 38th move, the tablebase lists 6 other White moves under the heading "Win prevented by 50-move rule". So what is special about only 39. Nd7+ that it gets the different heading "Win or 50 moves by prior mistake"? With the other six moves, you also made at least one prior mistake if the game is drawn by the 50-move-rule, otherwise this endgame is obviously won.
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