Section B1 – Min Win
1.Be7
( 1.Rd8+? Ke2! 2.Ng3+ Kf3 3.Rd3+ Kg2! 4.Bd6 c2 =, quiet )
1…c2 2.Bg5+ Ke2 3.Ra1
White’s Rook and Bishop took control of the pawn promotion square
3…Rg4! 4.Ra2
( 4.Kf5? Rxg5+! 5.Kxg5 Kd2 =, quiet Sacrifice of a Rook followed by promotion of a pawn is Black counterplay )
4…Rc4
( 4…Rxg5+? 5.Kxg5 Kd3 6.Nf2+ Kc3 7.Ra3+! Kb2 8.Re3!! c1=Q 9.Nd3+ +- )
5.Kh5!
( 5.Kf5? Kf3 6.Ra1 Rc5+! =, quiet )
5…Kf3 6.Ra1 Kg2
The White Knight is blocked in the corner. How to win?
7.Rc1
( loss of a tempo 7.Re1? Rd4
( 7…Rb4 )
8.Rc1 Rd1 9.Rxc2+ Kxh1 10.Kg4 Rg1+! Position B1 with wKg4 – there is a check! 11.Kf4 Rg2! =, quiet )
7…Rb4
( or 7…Rd4 8.Be3! )
8.Bh6!!
Main line
( Logical try 8.Be3? Position A1 with bRb4 8…Kf3! 9.Bg5
( 9.Bd2 Rb1 10.Kh4 Ke2 11.Bf4 Rxc1 12.Bxc1 Kd1 =, quiet )
9…Rb1 10.Kh4 Kg2 11.Rxc2+ Kxh1 After losing the Knight the drawn endgame is Rook and Bishop vs Rook 12.Kg4 Rg1+ Position B1 with wKg4 – there is a check! 13.Kf4 Rg2! =, quiet
( no 13…Rf1+? 14.Ke4! Rg1 Position B with Ke4 without a check! 15.Bf4 +- )
)
( Logical try 8.Bd2? Rb1 9.Rxc2 Kxh1 Draw endgame Rook and Bishop vs Rook 10.Kg4 Rb3! Position C4 with wBd2 and wKg4 – The Bishop has blocked the Rook, there is no move Re2 and no move Be3! 11.Kf4
( 11.Bf4 Kg1! 12.Re2 Kf1! =, quiet )
11…Rh3! 12.Ra2 Kg1! 13.Be3+ Kf1 =, quiet )
8…Re4
( Additional thematic line 8…Rb1 9.Rxc2+ Kxh1 After losing the Knight the winning endgame is Rook and Bishop vs Rook 10.Kg4! Rb3 Position C with wBh6 – The Bishop will not block the Rook, there is a move Re2! 11.Re2!
( 11.Rd2? Kg1! =, quiet )
11…Kg1 12.Be3+ Kf1 13.Kf3 Rd3 14.Rh2!
( 14.Ra2? Ke1 =, quiet )
14…Ke1 15.Rh1# )
9.Bd2! Rd4 10.Be3!
Position A with bRd4. After the preliminary maneuver of the Bishop, the Black Rook is under attack. Main lineA
10…Re4
( Main line B 10…Rc4 11.Kg6!! White paradoxically includes the King in the game!
( loss of time 11.Rg1+?! Kh2 12.Rf1 Kg2 )
11…Re4 12.Bg5 Rb4 13.Kf5! c) 13…Rd4
( d) 13…Rb1 14.Rxc2+ Kxh1 Winning endgame is Rook and Bishop vs Rook 15.Ke4!
( 15.Kg4? Rg1+ 16.Kf4 Rg2! =, quiet )
15…Rg1 Position B with wKe4 – no check! The Bishop is moving! 16.Bf4! Rg2 17.Rc1+! Rg1 18.Rc3!
( loss of time 18.Rc8 Rg2 19.Rc1+ Rg1 )
18…Re1+ 19.Kf3
( 19.Be3? Kg2! 20.Rc2+ Kg3! =, quiet )
19…Rf1+ 20.Kg3 Rg1+ 21.Kh3 Rg2 22.Bg3
( loss of time 22.Rc1+ Rg1 23.Rc3 Rg2 )
22…Rh2+ 23.Kg4
( 23.Bxh2? =, quiet stalemate )
23…Ra2 24.Kf3 +- )
14.Be3! Rb4 15.Bd2 Rb1 16.Rxc2 Kxh1 Winning endgame is Rook and Bishop vs Rook 17.Kf4!
( 17.Kg4? Rb3! Position C4 with wBd2 and wKg4 – no a move 18.Be3. 18.Bf4 Kg1! 19.Re2 Kf1! =, quiet )
17…Rb3 Position Ñ2 with wBd2 and wKf4 – there is a move Be3! 18.Be3 +- )
( Additional line 10…Rd3 11.Bf4! Kf3 12.Bh6!
( loss of time 12.Rf1+ Kg2 13.Rc1 Kf3 )
12…Rd1 13.Kh4! Rxc1
( 13…Rd4+ 14.Kh3 +- )
14.Bxc1 Kg2 15.Ng3 +- The King saved the Knight )
11.Rg1+! Kh2 12.Bf2! Rc4 13.Rc1 Kg2 14.Kg5 Rb4 15.Bg3!
a)
15…Rd4
( b) 15…Rb1 16.Rxc2+ Kxh1 Winning endgame is Rook and Bishop vs Rook 17.Kg4! Kg1
( 17…Rb3 Position C1 with wBg3 – The Bishop covers the King, there is a move Kh3! 18.Kh3 Rb1 19.Rh2+ Kg1 20.Bf2+ Kf1 21.Rh1+ +- )
18.Bf2+!
( 18.Kh3? Rd1!! 19.Rg2+ Kf1 20.Rf2+ Ke1 21.Ra2+ Kf1 =, quiet )
18…Kf1 19.Kf3 Rb3+ 20.Be3 +- )
16.Kf5
( 16.Rxc2+? Kxh1 Draw endgame Rook and Bishop vs Rook 17.Bf4 Rd3! Position C5 with wKg5 and wBf4 – White is late! 18.Kg4 Kg1! 19.Re2 Kf1! =, quiet )
16…Rb4 17.Be5! Rb1 18.Rxc2+ Kxh1
Winning endgame is Rook and Bishop vs Rook
19.Ke4!
( 19.Kg4? Rb3! 20.Bg3 Position C1 with wBg3 – The Bishop covers the King, but Black to move! 20…Kg1 =, quiet )
19…Rb3
Position C3 with wKe4 and wBe5 – there is a move Bc3!
( 19…Re1+ 20.Kf4 Kg1 21.Bd4+ Kf1 22.Rf2+ Kg1 23.Kg3 +- )
20.Bc3! Rb8
( 20…Kg1 21.Kf3 Ra3 22.Kg3 Kf1 23.Rf2+ Kg1 24.Rf3 +- )
( 20…Rb5 21.Bd2 Kg2 22.Bf4+ Kh3 23.Kf3 Rb3+ 24.Be3 +- )
21.Bd2! Rh8 22.Kf3! Rh3+ 23.Kf2 Rh2+ 24.Kg3 Rg2+ 25.Kf3 Kh2 26.Bf4+ Kh1 27.Rc1+ Rg1 28.Rc3 Rf1+ 29.Kg3 Rg1+ 30.Kh3 +-
White’s coordinated play led to a winning Rook and Bishop vs. Rook endgame in multiple lines.
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