EGTB Testsuite

[Edmund]

And another KRPPKQ

[D]3k3q/2R5/1P6/8/8/8/4P3/2K5 w - - 0 1

Rc4 wins

Engines prefer Kingmoves

[David Dahlem]

Try this one please:

[D]2k4q/3R4/1P6/8/8/8/4P3/2K5 w - - 0 1

only Rd3 draws (forming a fortress)

Rc7 loses in 56

Easy for Sage, without tablebases ...

FEN: 2k4q/3R4/1P6/8/8/8/4P3/2K5 w - - 0 1

Sage 3.38:
4 00:00 454 3.492 0.00 Rd7d3 Kc8b7 Kc1c2
5 00:00 593 4.561 0.00 Rd7d3 Kc8b7
6 00:00 1.186 9.123 0.00 Rd7d3 Kc8b7 Kc1c2 Kb7xb6
7 00:00 2.364 18.184 0.00 Rd7d3 Kc8b7 Kc1c2 Kb7xb6 Kc2b1
8 00:00 6.142 47.246 0.00 Rd7d3 Kc8b7 Kc1c2 Kb7xb6 Rd3b3+ Kb6a5 Kc2b1
9 00:00 13.067 100.515 0.00 Rd7d3 Kc8b7 Kc1c2 Kb7xb6 Rd3b3+ Kb6a5 Rb3a3+ Ka5b4 Ra3b3+ Kb4a5
10 00:00 54.874 322.788 0.00 Rd7d3 Kc8b7 Kc1c2 Kb7xb6 Rd3b3+ Kb6a5 Rb3a3+ Ka5b4 Ra3b3+ Kb4a5
11 00:00 129.366 588.027 0.00 Rd7d3 Kc8b7 Kc1c2 Kb7xb6 Rd3b3+ Kb6a5 Rb3a3+ Ka5b4 Ra3b3+ Kb4a5
12 00:00 398.739 886.086 0.00 Rd7d3 Kc8b7 Kc1c2 Kb7xb6 Rd3b3+ Kb6a5 Rb3a3+ Ka5b4 Ra3b3+ Kb4a5
13 00:02 1.873.906 1.035.307 0.00 Rd7d3 Kc8b7 Kc1c2 Kb7xb6 Rd3b3+ Kb6a5 Rb3a3+ Ka5b4 Ra3b3+ Kb4a5

Regards
Dave

[David Dahlem]

And another KRPPKQ

[D]3k3q/2R5/1P6/8/8/8/4P3/2K5 w - - 0 1

Rc4 wins

Engines prefer Kingmoves

Also easy for Sage, without tablebases ...

FEN: 3k3q/2R5/1P6/8/8/8/4P3/2K5 w - - 0 1

Sage 3.38:
4 00:00 284 2.184 0.00 Kc1b1 Qh8h1+
5 00:00 366 2.815 0.00 Kc1b1 Qh8h1+
6 00:00 704 5.415 0.00 Kc1b1 Qh8h1+ Kb1a2 Qh1g2 Ka2a1
7 00:00 1.676 12.892 0.00 Kc1b1 Qh8h1+ Kb1a2 Qh1g2 Ka2a1 Qg2xe2
8 00:00 9.987 76.823 0.00 Kc1d1 Qh8d4+ Kd1c2 Qd4xb6 Rc7c3 Qb6a5 Kc2b2
9 00:00 39.128 244.550 0.00 Kc1c2 Qh8d4 Rc7c3 Qd4xb6 e2e3 Qb6g6+ Rc3d3+ Kd8e8 Kc2d2
10 00:00 198.450 640.161 0.00 Rc7c4 Qh8h1+ Kc1c2 Qh1e1 Kc2b3 Qe1xe2 Rc4d4+ Kd8c8 b6b7+ Kc8xb7 Kb3c3
11 00:00 398.409 766.171 0.00 Rc7c4 Qh8h1+ Kc1c2 Qh1e1 Kc2b3 Qe1xe2 Rc4d4+ Kd8c8 b6b7+ Kc8xb7 Rd4b4+ Kb7c8 Kb3c3
12 00:01 911.310 893.441 0.00 Rc7c4 Qh8h1+ Kc1c2 Qh1e1 Kc2d3 Qe1g1 Kd3c2 Qg1xb6 Rc4c3 Kd8e7 Rc3d3
13 00:03 3.031.045 935.507 -0.01 Rc7c4 Qh8h6+ Kc1c2 Qh6xb6 Rc4c3 Kd8e7 Rc3d3 Qb6a7 Kc2b2 Qa7b8+ Kb2c2 Qb8c7+

Regards
Dave

[Jouni]

Dann: your positions are not good for EGTB testing. Rybka solves about 72/75 without tablebases And may be also 72 with them.

Jouni

[Kirill Kryukov]

Thanks for the positions! I added them into the list to analyze when I have time.

In other news, I updated the introduction post with new information.

[Kirill Kryukov]

And another KRPPKQ

[D]3k3q/2R5/1P6/8/8/8/4P3/2K5 w - - 0 1

Rc4 wins

Engines prefer Kingmoves

Sorry, I have to reject this position. Most of engines I tried choose Rc4 very soon without any tablebases, even without understanding it is a draw. (Though they often change their preference to other moves later).

[Kirill Kryukov]

And another KRPPKQ

[D]3k3q/2R5/1P6/8/8/8/4P3/2K5 w - - 0 1

Rc4 wins

Engines prefer Kingmoves

Also easy for Sage, without tablebases ...

FEN: 3k3q/2R5/1P6/8/8/8/4P3/2K5 w - - 0 1

Sage 3.38:
4 00:00 284 2.184 0.00 Kc1b1 Qh8h1+
5 00:00 366 2.815 0.00 Kc1b1 Qh8h1+
6 00:00 704 5.415 0.00 Kc1b1 Qh8h1+ Kb1a2 Qh1g2 Ka2a1
7 00:00 1.676 12.892 0.00 Kc1b1 Qh8h1+ Kb1a2 Qh1g2 Ka2a1 Qg2xe2
8 00:00 9.987 76.823 0.00 Kc1d1 Qh8d4+ Kd1c2 Qd4xb6 Rc7c3 Qb6a5 Kc2b2
9 00:00 39.128 244.550 0.00 Kc1c2 Qh8d4 Rc7c3 Qd4xb6 e2e3 Qb6g6+ Rc3d3+ Kd8e8 Kc2d2
10 00:00 198.450 640.161 0.00 Rc7c4 Qh8h1+ Kc1c2 Qh1e1 Kc2b3 Qe1xe2 Rc4d4+ Kd8c8 b6b7+ Kc8xb7 Kb3c3
11 00:00 398.409 766.171 0.00 Rc7c4 Qh8h1+ Kc1c2 Qh1e1 Kc2b3 Qe1xe2 Rc4d4+ Kd8c8 b6b7+ Kc8xb7 Rd4b4+ Kb7c8 Kb3c3
12 00:01 911.310 893.441 0.00 Rc7c4 Qh8h1+ Kc1c2 Qh1e1 Kc2d3 Qe1g1 Kd3c2 Qg1xb6 Rc4c3 Kd8e7 Rc3d3
13 00:03 3.031.045 935.507 -0.01 Rc7c4 Qh8h6+ Kc1c2 Qh6xb6 Rc4c3 Kd8e7 Rc3d3 Qb6a7 Kc2b2 Qa7b8+ Kb2c2 Qb8c7+

Regards
Dave

Thanks Dave!

If you have chance, could you analyze some of the other proposed positions? This would help a lot!

[David Dahlem]

quote]
Thanks Dave!

If you have chance, could you analyze some of the other proposed positions? This would help a lot![/quote]

Sorry but i just don't have any spare time to analyze those postions.

Regards
Dave

[Kirill Kryukov]

Try this one please:

[D]2k4q/3R4/1P6/8/8/8/4P3/2K5 w - - 0 1

only Rd3 draws (forming a fortress)

Rc7 loses in 56

Most of engines I tried find 1.Rd3 in about a second without tablebases. Yes, it is not easy to construct a good endgame tablebase test. Thanks for trying though!

[Cubeman]

And another KRPPKQ

[D]3k3q/2R5/1P6/8/8/8/4P3/2K5 w - - 0 1

Rc4 wins

Engines prefer Kingmoves

Sure you mean Rc4 Draws!