Shouldn't this be a draw?

[AdminX]

Shouldn't this be a draw?

[d]7k/8/4KN2/8/8/8/1bb5/8 w - - 0 53

The position is from a game my system played on Playchess. My system was playing Black. I think the opponent was playing in Centaur mode. Rybka shows a Tablebase mate in 70 moves here. However does not the 50 move rule apply here? Yet after Black's 63rd move White resigned.

[d]2b5/8/5b2/4k3/2K5/8/8/3N4 w - - 0 64

Note Rybka was showing mate in 59 moves at this point. In enegine vs engaine games alot of engines would resign if contempt is not set correctly.

[BubbaTough]

Perhaps the knight is captured in slightly less than 50 moves, and then the rest of the moves are for mate after capturing the knight.

-Sam

[AdminX]

Perhaps the knight is captured in slightly less than 50 moves, and then the rest of the moves are for mate after capturing the knight.

-Sam

No, I ran a shootout on this with Deep Sjeng WC2008 and Rybka 3 to check my thoughts just now and by move 102 this was the position:

[d]1NK5/8/3k4/b7/8/8/6b1/8 w - - 0 103
Note now it shows mate in 20. I guess they resigned to soon.

[CRoberson]

It is a 5 man endgame. Why not walk through the tablebases?

The only issue is whether or not to call draw by 50 move rule.

Some computer chess tournaments give precedence to EGTB over
the 50 move rule. So, it would depend on the specific rules of the
competition at hand.

[swami]

Shouldn't this be a draw?

Rybka shows a Tablebase mate in 70 moves here. However does not the 50 move rule apply here? Yet after Black's 63rd move White resigned.

Why should the 50 moves rule apply here? White still has a knight.

Only with the lone king, 50 moves rule countdown starts.

[AdminX]

Shouldn't this be a draw?

Rybka shows a Tablebase mate in 70 moves here. However does not the 50 move rule apply here? Yet after Black's 63rd move White resigned.

Why should the 50 moves rule apply here? White still has a knight.

Only with the lone king, 50 moves rule countdown starts.

The fifty-move rule in chess states that a player can claim a draw if no capture has been made and no pawn has been moved in the last fifty consecutive moves.

[Harvey Williamson]

Shouldn't this be a draw?

Rybka shows a Tablebase mate in 70 moves here. However does not the 50 move rule apply here? Yet after Black's 63rd move White resigned.

Why should the 50 moves rule apply here? White still has a knight.

Only with the lone king, 50 moves rule countdown starts.

I think the rule is 50 moves with no captures or pawn moves.

[AdminX]

It is a 5 man endgame. Why not walk through the tablebases?

The only issue is whether or not to call draw by 50 move rule.

Some computer chess tournaments give precedence to EGTB over
the 50 move rule. So, it would depend on the specific rules of the
competition at hand.

I did, and also used shootout to verify my point. I just was not sure if I had missed something in the rules, because I was very supprised the other side resigned.

[CRoberson]

Here is the pgn from the endgame. This is the longest path but there
were alternate long paths. After 59 moves the Knight is captured.


[D] 7k/8/4KN2/8/8/8/1bb5/8 w - - 0 1

1.Ng4 Bb1 2.Nf2 Kg7 3.Nd1 Ba1 4.Ne3 Ba2+ 5.Kf5 Kf7 6.Ke4 Ke6 7.Kd3 Bg7 8.Ke4 Bb1+ 9.Kf4 Bf8 10.Nc4 Bg6 11.Kf3 Bg7 12.Ne3 Ke5 13.Nc4+ Kd5 14.Ne3+ Kd4 15.Ng2 Be5 16.Ke2 Bh5+ 17.Kf2 Kd3 18.Ne1+ Ke4 19.Ng2 Bc7 20.Ne1 Kf4 21.Nd3+ Kg4 22.Ke3 Bb6+ 23.Kd2 Bd4 24.Nb4 Kf3 25.Kd3 Be3 26.Kc3 Ke4 27.Nd3 Bd1 28.Nb2 Bd4+ 29.Kd2 Bb3 30.Nd1 Bg7 31.Nc3+ Kd4 32.Ne2+ Kd5 33.Nf4+ Ke4 34.Ne2 Bh6+ 35.Kc3 Bf7 36.Ng3+ Kd5 37.Kd3 Be8 38.Ke2 Ke5 39.Kf3 Bf4 40.Kg4 Bc6 41.Nh5 Be3 42.Ng3 Bc5 43.Ne2 Ba4 44.Nf4 Ke4 45.Ng6 Bb6 46.Kg3 Ke3 47.Nh4 Bc7+ 48.Kg4 Bd7+ 49.Kh5 Bd8 50.Ng2+ Kf3 51.Nh4+ Ke4 52.Ng6 Be8 53.Kh6 Kf5 54.Nf8 Bf6 55.Nh7 Bb2 56.Nf8 Kf6 57.Nh7+ Kf7 58.Kg5 Kg7 59.Nf6 Bxf6+ *

[swami]

Shouldn't this be a draw?

Rybka shows a Tablebase mate in 70 moves here. However does not the 50 move rule apply here? Yet after Black's 63rd move White resigned.

Why should the 50 moves rule apply here? White still has a knight.

Only with the lone king, 50 moves rule countdown starts.

The fifty-move rule in chess states that a player can claim a draw if no capture has been made and no pawn has been moved in the last fifty consecutive moves.

Yes, Then probably the knight capture will have taken place leading to the mate in 70 in the first position, no? Ditto for the 2nd one as well.