[Event "Jan Timman-65 JT, 3-4 hm (version)"]
[Site ""]
[Date "2017"]
[White "1. Sergiy Didukh"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "1n6/1R2PpN1/3R1p1k/1N2p2P/6pn/1B4Pp/7K/2q5 w - - 0 1"]
[PlyCount "21"]

1. Nf5+ $1 Nxf5 (1... Kxh5 2. Nxh4 {knight defends g2.}) 2. Rxf6+ Kg7 $1 {
Black's plan is to sacrifice his pawn f7 for a stalemate on move 11.} ({
Second main line.} 2... Kg5 3. Rxf5+ Kxf5 4. Nd6+ Kg5 5. Ne4+ Kf5 6. Rc7 $1 (6.
Bd1 $2 Kxe4 7. Bxg4 Qd2+ 8. Kxh3 Qc1 $1 9. Rb4+ Ke3 10. Bf5 Nd7 11. Rb1 Qc8 12.
Rb8 Qxb8 13. Bxd7 Qh8 $11) 6... Qxc7 (6... Nc6 7. Rxc6 Qxc6 8. e8=Q $1 Qxe8 9.
Nd6+) 7. e8=N $1 (7. e8=Q $2 Kxe4 8. Qg8 Qd7 9. Qg5 Nc6 10. Bc2+ Kd5 11. Bf5
Nd4 $11) 7... Qc1 8. N8d6# {model mate by promoted knight.}) 3. Rxf7+ Kh6 4.
Rf6+ (4. Rb6+ $2 Nc6) 4... Kg5 5. Rxf5+ Kxf5 6. Nd6+ Kg5 7. Ne4+ Kf5 8. Rc7 $1
(8. Be6+ $2 Kxe4 9. Bxg4 Qf1 10. Bxh3 Qf7 11. h6 Kf3 $11) 8... Nc6 $1 9. Rxc6
Qxc6 10. e8=B $1 (10. e8=Q $2 Qc2+ $1 11. Bxc2 {stalemate.}) 10... Qc1 11. Bg6#
{model mate by promoted bishop. Black's logical idea is outplayed by another
minor promotion. Two model mates in the centre by promoted pieces.} 1-0

[Event "Olympic tourney, 1 prize"]
[Site ""]
[Date "2018"]
[White "2. Sergiy Didukh"]
[Black ""]
[Result "1/2-1/2"]
[SetUp "1"]
[FEN "5K1R/6pP/3p1p2/6kp/3p1p2/1N1q4/P2P1P2/8 w - - 0 1"]
[PlyCount "29"]

1. Nc1 $3 {White's foreplan.} ({Logical try} 1. Rg8 $2 Qxh7 2. Rxg7+ Qxg7+ 3.
Kxg7 h4 4. Nxd4 Kg4 $1 5. f3+ Kg5 6. Ne6+ Kf5 7. Nd4+ Ke5 8. Nc6+ Kd5 9. Ne7+
Kc4 $1 {Black's foreplan.} (9... Kc5 $2 10. Ng6 h3 11. Nxf4 h2 12. Nd3+ $1) 10.
d3+ (10. Nf5 h3 11. Nxd6+ Kd3 $1 $19) 10... Kc5 $1 11. Ng6 (11. Ng8 f5 $1)
11... h3 12. Nxf4 h2 $19 {and 13.Nd3+ is impossible.}) 1... Qc2 2. Rg8 Qxh7 3.
Rxg7+ Qxg7+ 4. Kxg7 d3 $1 (4... h4 5. Ne2 h3 (5... Kg4 6. Ng1 $11) 6. Ng1 $1 h2
7. Nf3+) 5. Nb3 $1 (5. Nxd3 $2 h4 6. f3 h3 7. Nf2 h2 8. a4 Kh4 9. a5 Kg3 10.
Nh1+ Kg2 11. a6 Kxh1 12. a7 Kg2 13. a8=Q h1=Q $19) 5... h4 6. Nd4 Kg4 $1 7. f3+
Kg5 $1 (7... Kg3 8. Nf5+ Kxf3 9. Nxh4+ Ke2 10. a4 $11) 8. Ne6+ Kf5 9. Nd4+ Ke5
10. Nc6+ Kd5 11. Ne7+ Kc4 (11... Kc5 12. Ng6 h3 13. Nxf4 h2 14. Nxd3+ Kd4 15.
Nf2) (11... Ke6 12. Ng6 h3 13. Nxf4+) 12. Nf5 $1 h3 13. Nxd6+ {
(13...Kd3 is impossible)} Kb4 14. Ne4 h2 15. Nf2 $11 {Knight and King make
similar manoeuvres to block d3 by an enemy pawn and not let each other on this
square on move 13.} 1/2-1/2

[Event "WCCT-10, 9-10 place"]
[Site ""]
[Date "2016"]
[White "3. Sergiy Didukh"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "1r3N2/b4p2/4N2p/8/3p1P1k/8/3q1PP1/Q6K w - - 0 1"]
[PlyCount "29"]

1. Qa3 $1 {Before capturing the bishop wQ forces move d3 so as to open the
a7-g1 diagonal and defend f2. But Black can thwart this plan.} Rb3 $1 ({After} 
1... d3 2. Qxa7 {wQ defends f2.} Rb1+ 3. Kh2 Qe1 4. Qe7+ Kg4 5. f3+ $18) 2.
Qxb3 (2. Qe7+ $2 Kg4 3. Qxf7 (3. Qd7 Rh3+ 4. gxh3+ Kf3 $11) 3... Rb5 $1 4. Qg7+
Rg5 5. fxg5 Qc1+ 6. Kh2 Bb8+ 7. g3 Bxg3+ 8. Kg2 Qc6+ {draw.}) 2... d3 3. Nc5 $3
(3. Ng6+ $2 fxg6 {shows that Ne6 is an obstacle (Qe6 is impossible).}) ({
Logical try shows another obstacle on move 12.} 3. Nd4 $2 Bxd4 $1 (3... Kg4 $2
4. Nf3 Qc1+ 5. Kh2 Qxf4+ 6. g3 Qxf3 7. Qa4+ Kg5 8. Qxa7 Qd5 9. Qc7 Kf6 10. Nd7+
$18) 4. Ng6+ fxg6 5. Qe6 $1 Qd1+ 6. Kh2 Qg4 7. g3+ Kh5 8. Qd5+ Qf5 9. Qf3+ Qg4
10. Qh1 $1 g5 11. f3 Qc8 12. f5 Qc2+ $1 13. Kh3 g4+ 14. fxg4+ Kg5 15. Qd5 Kf6
$1 16. Qxd4+ Ke7 $11) 3... Bxc5 (3... Qxf2 4. Qxd3 Qxc5 5. Qh3#) 4. Ng6+ $1
fxg6 5. Qe6 $1 Qd1+ (5... Qxf4 6. g3+ {fork-1}) 6. Kh2 Qg4 7. g3+ Kh5 8. Qd5+
Qf5 9. Qf3+ Qg4 10. Qh1 $1 g5 11. f3 Qc8 (11... Qe6 12. g4+ Kg6 13. f5+ {fork-2
}) 12. f5 $1 {Now Qc2+ is impossible.} g4 (12... Qxf5 13. g4+ {fork-3}) 13.
Kg2+ Kg5 14. Qh4+ Kxf5 15. Qxg4+ {1-0. Deep foresight. Solution and logical
try begin with different N-sacrifices.} 1-0

[Event "e4 e5, 100 Years Cup"]
[Site ""]
[Date "2018"]
[White "4. Sergiy Didukh"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "8/1p1N1p1k/b1q2P2/2p1p3/1p2p2p/2b5/6KP/2Q1B3 w - - 0 1"]
[PlyCount "25"]

1. Qg5 $1 {The right way to create threat Qg7#.} ({After} 1. Nf8+ $2 Kg8 2. Qh6
h3+ {/Bf1+} 3. Kg1 Bd4+ 4. Bf2 Bxf2+ 5. Kxf2 e3+ 6. Kxe3 Qg2 $1 {
Black stops the mate.}) 1... Bf1+ $1 {Anticritical move.} ({
Second main line shows another preparation of Qg2.} 1... h3+ 2. Kg1 Bd4+ 3. Bf2
Bxf2+ 4. Kxf2 e3+ 5. Kxe3 Qg2 6. Nf8+ Kh8 7. Ng6+ $1 Kg8 (7... fxg6 8. Qh6+ Kg8
9. Qg7# {g-file is closed by Pg6.}) 8. Ne7+ Kf8 9. Qh6+ Ke8 10. Qh8+ Kd7 11.
Qc8+ Kd6 12. Nf5+ Kd5 13. Qd7+ Kc4 14. Qd3#) 2. Kg1 (2. Kxf1 $2 Qa6+ 3. Kg1
Bd4+) 2... Bd4+ 3. Bf2 Bxf2+ 4. Kxf2 e3+ 5. Ke1 $1 ({Logical try} 5. Kxe3 $2
Qg2 6. Nf8+ Kh8 7. Ng6+ Kg8 8. Ne7+ Kf8 9. Qh6+ Ke8 10. Qh8+ Kd7 11. Qc8+ Kd6
12. Nf5+ Kd5 13. Qd7+ Kc4 14. Qd3+ Bxd3 $1 {
Bishop is on the right side of the critical square d3.}) 5... Qg2 6. Nf8+ Kh8
7. Ng6+ $1 Kg8 8. Ne7+ Kf8 9. Qh6+ Ke8 10. Qh8+ Kd7 11. Qc8+ Kd6 12. Nf5+ Kd5
13. Nxe3+ $1 {That's why King didn't go to e3. White and black deep foresights
with sacrifices (Bf1+! Ng6+!) and capture refusals.} 1-0

[Event "Shakhmatnaya kompozitsia, 3 prize (version)"]
[Site ""]
[Date "2016"]
[White "5. Sergiy Didukh"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "8/3K1b2/kP6/8/4B3/8/NR6/4q3 w - - 0 1"]
[PlyCount "19"]

1. Nb4+ Ka5 2. Nc6+ Ka6 $1 3. b7 Be8+ $1 {
Black's plan is to sacrifice his bishop and queen for stalemate.} ({No time for
} 3... Qxe4 4. b8=N#) ({After} 3... Be6+ {the wK uses the bishop as a shield.}
4. Ke8 $1 Bf7+ 5. Kf8 $18) 4. Kc8 Bd7+ 5. Kxd7 (5. Kd8 $2 Qh4+ 6. Ne7 Qh8+ 7.
Kxd7 Qxb2 $11) 5... Qd1+ 6. Rd2 $1 (6. Kc7 $2 Qd7+ 7. Kxd7 {stalemate.}) 6...
Qxd2+ 7. Kc8 $22 {Domination and zz. White hasn't created any threat but d2 is
the only safe square for the queen.} Qd6 (7... Qe3 8. Bd3+ $1 Kb6 9. b8=Q+ Kxc6
10. Be4+ $1 Kc5 (10... Qxe4 11. Qb7+) 11. Qa7+) (7... Qg5 8. Bd3+ Kb6 9. b8=Q+
Kxc6 10. Qc7+ Kd5 11. Qa5+) (7... Qh6 8. Bd3+ Kb6 9. b8=Q+ Kxc6 10. Qb5+ Kd6
11. Qb6+) (7... Qc3 8. Bd3+ Kb6 9. b8=Q+ Kxc6 10. Qc7+) 8. Bd3+ $1 Kb6 (8...
Qxd3 9. Nb4+) 9. b8=Q+ Kxc6 {Black saved his Queen but not King.} 10. Qb5# {
Mutual annihilations of pieces. Domination with multiple Q-skewers.} 1-0

[Event "A.Selivanov-50 JT, 2 prize"]
[Site ""]
[Date "2017"]
[White "6. Sergiy Didukh"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "7R/4r2P/8/6P1/6K1/1pp5/4P1p1/6Nk w - - 0 1"]
[PlyCount "23"]

1. Rd8 $1 ({Logical try} 1. Ra8 $2 Rxh7 2. Ra1 Ra7 $1 3. Re1 Ra4+ $1 4. Kg3 Ra1
5. Rxa1 b2 6. Re1 b1=Q 7. Rxb1 c2 8. Re1 c1=Q 9. Rxc1 {stalemate.}) (1. g6 $2
Kxg1 2. Rf8 Re4+ 3. Kg3 Re3+ 4. Rf3 Rxf3+ 5. Kxf3 Kf1 $11) 1... Rxh7 2. Rd1 Rd7
$1 (2... c2 3. Re1 b2 4. Nf3+ g1=Q+ 5. Rxg1#) 3. Re1 Rd4+ $1 4. Kg3 $1 ({
Logical try} 4. Kh3 $2 Rd1 $1 5. Rxd1 c2 6. Re1 c1=Q 7. Rxc1 b2 8. Rd1 b1=Q 9.
Rxb1 {stalemate.}) (4. e4 $2 Rxe4+ 5. Rxe4 Kxg1 6. Kg3 Kf1 $19) (4. Kh5 $2 Kh2
$1 5. Nf3+ Kg3 6. Nxd4 Kf2 7. Nf3 c2 8. g6 b2 9. g7 c1=Q 10. g8=Q b1=Q $11)
4... Rd1 5. Rxd1 c2 6. Re1 c1=Q 7. Rxc1 b2 8. Rd1 $1 {
(now d1 is not attacked by pawn)} b1=Q 9. Nh3+ $1 {
(that's why King didn't go to h3)} Qxd1 10. Nf2+ Kg1 11. Nxd1 Kf1 12. Ne3+ {
The final combination is prepared by the right first R-move foreseeing Black's
counterplay for stalemate.} 1-0

