[Event "10th WCCT"] [Site "?"] [Date "2016.??.??"] [Round "?"] [White "(5) Steffen Slumstrup Nielsen"] [Black "?"] [Result "1/2-1/2"] [Annotator "6th Place"] [SetUp "1"] [FEN "k5q1/2b1P3/K4n2/3R1P2/P2n4/8/8/5Q2 w - - 0 1"] [PlyCount "17"] [EventDate "2016.??.??"] 1. Rd8+ (1. Rxd4 $2 Qc8+ 2. Kb5 Qb7+ 3. Kc4 Qa6+ $19) 1... Bxd8 2. Qh1+ $1 { Not all queen sacrifices has to be played} ({Thematic try} 2. Qg2+ $2 Nd5 {A position of mutal zugzwang. White must create a disadvantageous block.} 3. a5 ( 3. Qxg8 Nb4#) (3. e8=Q Qxe8 $19) (3. f6 Qe6#) (3. exd8=Q+ Qxd8 $19) 3... Kb8 $1 4. exd8=Q+ Qxd8 5. Qb2+ Kc7 6. Qxd4 Nb4+ $1 7. Qxb4 Qa8+ 8. Kb5 Qc6# {POSITION A}) 2... Nd5 3. Qg2 $1 {But this queen sac is correct. We have the same zugzwang position with Black to move.} Kb8 $1 (3... Qxg2 4. exd8=Q#) (3... Bxe7 4. Qxg8+ $18) (3... Nb3 4. Qxg8 $18) (3... Nc6 4. Qxg8 $18) 4. exd8=Q+ (4. Qxg8 $2 Nb4#) 4... Qxd8 5. Qb2+ Kc7 6. Qxd4 Nb4+ 7. Qxb4 Qa8+ 8. Kb5 Qc6+ {POSITION B} 9. Ka5 $1 1/2-1/2