Interesting endgame

[Werner]

This position is from a game on Chessbase server:
[d]1n6/5pp1/2K5/7p/N7/P3k2P/6P1/8 w - - 0 1

Kb6!

How long needs your engine?

[mercury]

Hello
1.Kb6 Kf2 and it's a draw, no? I reached an endgame Q+N/Q+2p which should be a draw

[Werner]

Hi Ludovic,
this is the line I think will win:
46.Kb7 Nd7 47.Kc7 Ne5 48.Nb2 Kd4 49.Kd6 f6 50.a4 Nf7 51. Kc6 Nd8 52.Kb6 Nf7 53.a5...

[mercury]

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "1n6/5pp1/2K5/7p/N7/P3k2P/6P1/8 w - - 0 1"]
[PlyCount "17"]

1. Kb6 Kf2 2. Nc5 h4 3. Kb7 Kxg2 4. Kxb8 Kxh3 5. a4 Kg2 6. a5 h3 7. a6 h2 8. a7
h1=Q 9. a8=Q+ *

And it's a draw because White don't have pawns anymore.

[Werner]

This position is from a game on Chessbase server:
[d]1n6/5pp1/2K5/7p/N7/P3k2P/6P1/8 w - - 0 1

Kb6!

How long needs your engine?

sorry - this was a typo!
try Kb7

[MirceaH]

Hello Werner

ETChess 130108 which does not use endgame tables finds Kb7 in 4:15 minutes on a P4/2.8 GHz with 256 MB hash.

Regards,
Mircea

[mercury]

1.Kb7! I tried a few engines. AMD 1,8 GHz - Hash 32MB
Fritz 9 55s
Rybka 2.3.2a 31s
Alaric 707 and Spike 1.2 Turin not found in 5min
Fruit 2.3.1 2min02
Hiarcs 11 1min07
The main difficulty for engines is they don't see Kc7 is a draw after 1...Na6+, 2...h4 and 3...Kf2.