Analyze by hairulov and Fritz.
Khegay,WIM Anjela (2218) - Sumant,Subramaniam (1956) [E15]
Commonwealth Chess Championsh, India 04.12.2007 , Round 3
1.d4 Nf6 2.Nf3 e6 3.c4 b6 Sumant choose the Queen Indian Defense 4.g3 Ba6 5.b3 Bb4+ 6.Bd2 Be7 7.Bg2 d5 8.0–0 c6 9.Bc3 0–0 10.Nbd2 Nbd7 11.Re1 Rc8 12.e4 dxe4 13.Nxe4 Nxe4 14.Rxe4 Bf6 15.Re3 15...Qc7 16.Ne5 Nxe5 17.dxe5 Black position look a little bit cramped but his got the d file as the compensation. 17...Bg5 18.Rd3 Rfd8 19.f4 [19.Be4 Bb7 20.Qf3 Is an interesting plan. White hold black from playing c5 and threaten to double his rook on d file.] 19...Be7= 20.Rxd8+ Rxd8 21.Qf3 b5?! Sumant try to crack white pawn formation.But [21...Qd7 would be much better 22.Rc1= (22.Qxc6? is inferior since it leads to 22...Qd3–+ penetrating white position.) ] 22.b4? A rather dubious move. White probaly have better move e.g [22.Qxc6!? Qxc6 23.Bxc6 bxc4 24.b4 Intending a4-b5 later.] 22...c5 [Inferior is 22...bxc4 23.Qxc6 Qd7 24.Qxd7 Rxd7 25.Kf2] 23.a3?! [23.cxb5 Bxb5 24.a4 cxb4 25.Bxb4 Qc4] 23...bxc4 24.Qc6 Angela probaly tought that Sumant was forced to exchange queen and later she will have a better pawn pormation with a and b pawn compare to black c4 and c5 but Sumant has better idea 24...Qb6! 25.Kf1 [If 25.Qxb6 axb6 26.bxc5 Bxc5+ Now black who has the better pawn structure!] 25...Bb5 [25...Rd3 penetrating white position is better 26.Rc1 and now 26...Bb5 27.Qxb6 axb6 28.Be4 Re3 29.Bg2 g5! destroy white pawn structure!] 26.Qxb6 axb6 27.Be4 Ba4 [27...cxb4 28.axb4 f5 29.exf6 Bxf6 30.Be5] 28.Ke2 f5 29.exf6 Bxf6 30.Bxf6 gxf6 31.bxc5 bxc5 White new passed pawn: a3 are no much then black double passed pawn on c file! 32.Rc1 f5 Karsten Muller and Frank Lamprecht mention ih their book , Fundamental Chess Endings, the general rules in same colour bishop endings, your pawn chains are clearly better place on the opposite colour to your bishop. This because it can't be attacked by your opponent bishop and it restric the opponent's king. But here the rook is still on board but black should probaly considered it. [32...Kf7 33.Ke3 Rd4 34.g4 (34.Bxh7? fails to 34...f5–+) ] 33.Bb1 Rd4 34.Rc3 Kf7 35.Ke3 [35.Bc2 Bxc2 36.Rxc2 Ke7] 35...Bb3 36.Rc1 Ke7 37.g4 Kf6 [37...fxg4 38.Bxh7 Rd8 39.Be4–+ and black has to many weak pawn: a3,f4,h2 to defend.] 38.gxf5 exf5 39.Rg1 Rd8 40.h4 Rd5 [40...Bd1! 41.a4 (41.Rg5 Bg4) 41...c3–+]
41.Re1?? the passed pawn on c file must not be neglected. [41.Rc1] 41...Bd1–+ 42.Rg1 c3 43.Rg2 c4 44.Bc2 Bxc2 45.Rxc2 Rd3+ 46.Ke2 Ke6 White can resign here. 47.Rc1 Kd5 48.a4 Kd4 49.Ra1 [49.Rc2 there is nothing better in the position 49...Rh3 50.a5 Rh2+ 51.Kd1 Rh1+ 52.Ke2–+] 49...Rd2+ 50.Kf3 c2 0–1 Nice game Sumant