Difficult endgames

[Nordlandia]

Test position: Bishop Pair

Komodo assessment: 0.65 +/=

[d]6k1/pp3ppp/2n1r3/2b5/5B2/2P5/P3BPPP/3R1K2 w - - 0 18

https://nb.lichess.org/VvOLXFWl#34

[Nordlandia]

Kasparov vs Karpov | Las Palmas 1996

Komodo 10.4 assessment: 0.65 +/=

[d]4bnk1/p4pp1/4p3/2p5/4P3/P7/1P3BPP/3B1K2 b - - 0 36

https://nb.lichess.org/YkEGY9DF#71

[peter]

Hi!

[d]5B1r/1nk1KR2/8/6P1/8/8/n7/b7 w - - 0 0
Cook detected

Yes, as for a study, even if 50 moves boundary draws, because that doesn't matter considering the outcome of studies.

As for a game it would yet end up drawn

[Nordlandia]

Komodo assessment: -0.65

[d]6k1/3n1ppp/p7/1p2r3/8/2P5/PPBB1PPP/5K2 w - - 0 24

[Nordlandia]

Komodo assessment: -0.65

[d]2r3k1/5ppp/3n4/1p6/p2B4/P3PB1P/1P3PP1/5K2 w - - 0 31

Komodo assessment: +0.55

[d]4k3/ppp1p2p/5bp1/3P1b2/7P/1P3N2/P4RP1/5K2 w - - 0 29

Komodo assessment: +0.75

[d]5k2/1p1b2pp/4pb2/1P1p4/6P1/2p1PN2/2P4P/1R4K1 b - - 0 25

[d]8/1p4pk/2p4p/p1bp1b2/P7/4P3/1PPRNKP1/8 b - - 0 37

[d]3k4/6pp/1p2Pp2/pP2p3/3bbN2/PK6/6PP/2R5 b - - 0 34

[Nordlandia]

[d]8/pp6/4k2p/Pb2bpp1/1P2p3/7P/5PP1/3R1NK1 b - - 0 36

[d]6k1/1B3ppp/pp3n2/8/3B4/1P2P1P1/P1r2P1P/6K1 w - - 0 30

[d]1r3k2/3n1p2/p6p/P2BP1p1/1p1B1PP1/6P1/1P6/6K1 w - - 0 34

[d]4k3/3b4/pp1b2p1/2p2p2/P1P4p/1PN2R1P/6P1/6K1 b - - 0 33

[d]r1n1k3/p4pB1/2p1p2p/8/2P5/1B6/PP3PPP/6K1 b - - 0 29

[d]4n1k1/1p4pp/8/pPr2p2/2P5/P4PP1/1B4BP/6K1 w - - 0 28

[d]6k1/1p3ppp/4n2r/1B1PP3/p7/2P5/P5PP/4B1K1 b - - 0 32

[d]6k1/p4p2/4p1pb/1p2Pb1p/3R1P2/8/PPPN4/6K1 b - - 0 32

[d]4r1k1/1p3p1p/8/2BP1p2/pnP5/1P4PP/P5B1/6K1 b - - 0 29

[d]6k1/5p1p/1p2p1pb/p7/3Nb3/1PP4P/5PP1/3R2K1 b - - 0 34

[d]8/5p2/p3b3/1p1p1p2/2k2P1p/P3P3/1bNK2PP/6R1 w - - 0 36

[d]8/5k1p/2p1pbp1/2P2p2/2bPpP2/8/3R1NPP/6K1 w - - 0 35

[d]6R1/3kb1pp/p4p2/3pp3/b7/P5P1/1P1N1P1P/6K1 b - - 0 46

[d]5rk1/p6p/1p2n3/4Bpp1/1P6/4PP1P/P5P1/3B2K1 b - - 0 26

[d]8/ppb2pk1/2p3p1/4N2p/2P5/1P3KPb/P4P2/4R3 w - - 0 35

[d]8/pp1N2k1/2p2pp1/7p/2PR2b1/PPb3P1/5PK1/8 w - - 0 39

[d]6k1/8/p1pppBBr/2p4P/P1n5/8/1P2KP1P/8 w - - 0 40

[d]2R5/4b3/4k3/ppp2p2/5p1P/2PP1b2/PP3Np1/6K1 b - - 0 41

[d]2r2k2/4nppp/1p6/p7/4B3/P3P1B1/1P1K1PPP/8 w - - 0 27

[d]3r4/5kp1/4pn1p/ppB5/8/3B1P2/PPP3PP/1K6 w - - 0 30

[d]3b4/pp1k3p/2p2p2/3p4/8/3NR3/PPb2PPP/6K1 b - - 0 24

[d]8/p4k2/bp4pp/5p2/PP1b4/3p2P1/1P1R3P/4KN2 b - - 0 39

[d]2r3k1/5pp1/1p2p2p/8/n2B3P/P3P1P1/1P3P2/3B1K2 b - - 0 41

[d]3R4/4ppk1/p1bb4/1pp5/7p/2P4P/PP4P1/4N1K1 b - - 0 35

[d]6k1/p4p1p/2p3p1/1p1bN3/5P2/P1b3PP/2P2K2/1R6 b - - 0 24

[d]2k2r2/pp4p1/2p1n1Bp/P3P3/5P2/7P/1P4PB/2K5 w - - 0 34

[d]8/r2n1p2/3Bk2p/p1P3p1/5p2/PP1K1B2/5PPP/8 b - - 0 32

[d]8/4kpb1/b1p1p1p1/p2p4/7P/P4RP1/2P2PK1/1N6 b - - 0 31

[d]6k1/4b2p/p2pp1pP/6P1/1p6/5b2/PPPKN3/3R4 w - - 0 29

[d]2r5/1n3kpp/3pp3/1P3p2/1B6/P2BP1P1/5PKP/8 w - - 0 34

[d]2r5/4kpp1/pP2p2p/3nP3/PP6/5BP1/5B1P/1K6 b - - 0 41

[d]2r5/3k1pp1/pP2p2p/3nP3/PP6/5BP1/5B1P/1K6 w - - 0 42

[d]3R4/1p3pkp/p1b3p1/2b5/5p2/5N2/PPP3PP/3K4 w - - 0 28

[Nordlandia]

[d]8/B4ppk/2p1n2p/8/2B5/1P3P1P/P1P3PK/4r3 b - - 0 41

[d]8/4bk1p/p4p2/3ppp2/3NbP2/6P1/PP4P1/2R4K w - - 0 36

[d]6k1/p1rbp2p/3p1bp1/1p6/4P3/1N3P2/PP1R2P1/1K5R w - - 0 23

[d]6k1/p2bp3/3p1bp1/1p5p/4P3/5P2/PPKN2P1/7R b - - 0 25

[d]1k4r1/pp1r1p2/4p3/1B1pP3/5PPn/PR5P/2P5/2B1K3 b - - 0 28

Interesting

[d]2kb4/5pp1/p2pp3/Pb6/1p2P3/5P2/1PPK4/R1N5 b - - 0 27

[d]8/2R1p1k1/3p1bpp/p7/4Pp1P/1b6/1P1N1PP1/K7 b - - 0 34

[d]8/2k2p1p/p1p1b3/2b1pp2/R7/5PP1/P1P3KP/2N5 b - - 0 29

[d]8/1p1bbpk1/4p1p1/1P2P3/Ppp5/4P3/3N2P1/5RK1 b - - 0 32

The position is equal. Nice position to test against older engines.

[d]7k/pp1r2n1/3P2pp/3BB3/1p4P1/7P/PPP2K2/8 b - - 0 35

Black is slightly better | -0.30

[d]1k5r/1pn4p/p5p1/P4p2/3P1B2/5PPB/1P5P/6K1 w - - 0 32

[d]R7/3k4/ppp5/2p1b1p1/P1b4p/2N2P2/1P4PP/4K3 w - - 0 34

[Nordlandia]

[d]5rk1/7p/2Bp2p1/p4n2/2P5/3P2P1/PB3P1P/6K1 b - - 0 35

[d]4k3/pp3pp1/2b5/2b2p2/3N3p/1PP4P/P7/R5K1 w - - 0 31

[d]4k3/1p1b2p1/p3p3/P1b1p3/7p/1PN4P/2P2KP1/R7 w - - 0 35

" As for rook and knight vs. two bishops and pawn, with nothing else but pawns on the board, the rook's side has a mild advantage, but add a rook to each side and the game is dead even. In general, with other pieces on the board, this imbalance should be considered even, with only a trivial edge for the rook's side. "

[d]r5k1/1pp2ppp/3n4/2BP4/p4P2/P5P1/1PP1r1BP/5RK1 w - - 0 26

[d]4r1k1/1pp2ppp/3n4/3P4/pB3P2/P5P1/1PP1r1BP/2R3K1 b - - 0 27

[d]6k1/pN1bR1p1/2p4p/3p3P/1p1P1bP1/1P6/2P5/6K1 b - - 0 37

[d]r2r1k2/5ppp/p1p1pn2/q1p5/8/3PB1P1/1PP2P1P/3QRBK1 w - - 0 23

[d]5k2/1p1n1ppp/pq6/5P2/2BPr1P1/1P6/2P2B1P/3Q2K1 b - - 0 33

[d]5k2/1p3pp1/p1n5/5PP1/2PP1r1p/1P5P/5BK1/1B6 w - - 0 42

[d]5k2/1p3pp1/p7/3n1PP1/2PP1r1p/1P1B3P/5BK1/8 b - - 0 40

[d]2b5/p5k1/2p1p1pp/2bp4/8/2N5/PPP3PP/5R1K w - - 0 26

[d]8/pb3k1p/1p2p1p1/4b3/6p1/1P6/P4PPP/2RN2K1 b - - 0 31

Code: Select all

Indeed, two bishops and a pawn are often sufficient compensation for a rook and knight.

[d]2R5/p2r1k1p/1p2p1p1/1N1bb3/6p1/1P6/P4PPP/3R2K1 b - - 0 28

[d]8/pb3k1p/1p2p1p1/4b3/6p1/1P6/P4PPP/2RN2K1 b - - 0 31

[d]5rk1/pB4pp/4p3/2p1p3/P7/2BPP1P1/1P2P2P/n5K1 b - - 0 23

[d]5bk1/p1p2p1p/4b1p1/3p4/3P4/5N1P/Pr3PP1/R3R1K1 w - - 0 19

Marginally better for black.

[d]r1nq1bk1/7p/2p1bpp1/p3p3/1pN1P3/3P4/2PN1PPP/R2QR1K1 w - - 0 17

[d]r2q1bk1/7p/2p1bpp1/pn2p3/RpN1P3/3P4/2PNQPPP/4R1K1 w - - 0 19

[d]8/6kp/5pp1/2p1p3/bpNqP3/2bP4/4QPPP/2R2K2 w - - 0 32

[d]8/pp3kp1/2p4p/5p2/1b5N/1P4Pb/P1R2P1P/6K1 w - - 0 40

[d]2k5/pp1b2pp/5p2/3p4/3b4/N4P2/PP2K1PP/1R6 b - - 0 24

[d]8/1p3pk1/4pNpp/pP2Pb2/1b3P1P/5K2/7P/6R1 b - - 0 41

[d]2r1kb2/1b3p2/p3p1p1/P2pP1N1/Rp3P1P/3R4/1P4P1/6K1 b - - 0 30

[d]2r1k3/5p2/p3p1p1/PbbpP1N1/1p3P1P/8/1P4P1/R2R2K1 w - - 0 33

[d]7R/8/p3k1p1/P1b5/1p6/1P1bN1K1/8/8 w - - 0 61

[d]4b3/1p2bk1p/pPr1ppp1/4p3/2P1P3/1P1RNP2/6PP/R5K1 b - - 0 27

[d]1b3rk1/1pp2qp1/p1n4p/2P1pn2/1P2N3/P4NPP/1B3PBK/3Q4 w - - 0 25

[d]1b3rk1/1pp2qp1/p6p/2P1Bn2/1P2N3/P5PP/5PBK/3Q4 b - - 0 26

[d]3r1rk1/pp3ppp/2n5/8/5P2/P1B1P1P1/1PB4P/5RK1 b - - 0 24

[d]8/1b2b2p/p3k1p1/5p2/1pPPp3/4N1P1/4KP1P/R7 b - - 0 35

[d]1qr2k2/4bp1p/p1b1p1p1/1p5N/8/PP3PQ1/2PR2PP/3R3K w - - 0 32

[d]1r3k2/5p1p/p1b1p1p1/1p6/5N2/bP3P2/2PR2PP/3R3K w - - 0 34

[d]6k1/pp3ppp/1n6/3P1B2/2PP4/5PBP/Pr6/5K2 w - - 0 27

[d]5k2/pp3ppp/3P4/2P5/3PB3/4nPBP/Pr6/4K3 b - - 0 30

[d]4k3/pp3r1p/2pn2pB/3p4/3P2PP/2P2P2/PPB3K1/8 w - - 0 28

[d]4n3/pp1k1r1p/2p3pB/3p4/3P2PP/2P2P2/PPB3K1/8 w - - 0 28

[d]2kr3r/pp3pp1/2p2np1/P3p3/1qP3P1/4P2P/1BQPBP2/4K2R w K - 0 19

[d]r7/1p5k/2nBB1pp/1p2Pp2/5P2/2P5/P5PP/6K1 w - - 0 27

[d]bn3b1r/4kpp1/p3p2p/4p3/5q2/2N5/PPPQ2PP/2KR1B1R w - - 0 15

[d]8/4kp2/2b1p2p/p5p1/2P2p2/4b3/PP1NR1PP/2K5 w - - 0 27

[d]5r2/2p4p/1p4pk/4Bp1n/1P3P2/2P1P3/P4PB1/6K1 b - - 0 35

[d]4rbk1/pb3ppp/1p3n2/2ppq3/8/1PN1P3/PB3PPP/2RR1QK1 w - - 0 19

This position looks awful for white.

[d]4rbk1/pb3ppp/1p3q2/1Ppp4/N7/4P3/P4PPP/2RR1QK1 w - - 0 23

[d]7R/pb5p/1p3kp1/1P2bp2/P1p4P/5P2/4NK2/8 b - - 0 42

[d]r3kb1r/1p3pp1/2p1p2p/7N/p2Pb2P/2P5/PP3PP1/R1B2RK1 w kq - 0 18

[d]8/1b4k1/p1qp1bp1/1p3p1p/1P6/P2P4/2N1Q1PP/5R1K b - - 0 37

[d]8/ppb1kpp1/2p1b2p/4P3/6P1/1PN4P/P5K1/4R3 w - - 0 33

[d]6k1/6b1/p4pbp/2pNp3/2Pp4/1P5P/P5P1/4R1K1 w - - 0 37

[BeyondCritics]

Can black infiltrate/penetrate the white nerve center

[d]6k1/pp3p2/6p1/3p4/2pN4/P1P2P1P/1P1qR1P1/6K1 b - - 0 1

Seemingly a win, using the breakthroughs b4 and g4.
From this position Stockfish can navigate to the win:
[d]8/8/6k1/3p1p2/1ppN2p1/2P1qP1P/1PR3PK/8 w - - 0 1

In the article it is claimed, that white likely holds a draw with g3,f4.
I don't think so. The winning plan seems to be to exchange as much pawns as possible at the kingside and infiltrate with the king to e4-e3.
If white prevents this with g3,f4,h4, the black king goes h5-g4, e.g.
[d]8/8/6pk/3p1p2/1ppN1P1P/2P3P1/1PR3K1/4q3 b - - 0 1
Nevertheless white can hold this for a very long time.
Some programmers have speculated, that a win should materialize after e.g. 20 moves. This would be a counterexample.
There are counter examples with 40 full moves, shown in the endgame manuals of dvoretzky.

[Nordlandia]

Hello Oliver Roese

I will arrange last version of asmfish vs komodo 10.4.

Time control will be 45m+30s.

In that partigular endgame.

I will post result laster, stay tuned.