[Event "3rd UAPA Ty"] [Site "?"] [Date "2015.??.??"] [Round "?"] [White "Rusz, Árpád"] [Black "(Study 87)"] [Result "1-0"] [SetUp "1"] [FEN "K3n3/PB1k2p1/P5p1/4n1P1/1P2p3/3pP3/2bP4/8 w - - 0 1"] [PlyCount "21"] [EventDate "2015.??.??"] {http://www.problemistasajedrez.com.ar/ 2nd-internati-3rd-international-internet-tournament-studies-uapa-2015/ a-rusz-sec-b-1-no3-bview-php/} 1. Kb8 Nc7 (1... Kd6 2. a8=Q Nd7+ 3. Kc8 $1 (3. Ka7 $2 Nc7 4. Qh8 Nb5+ 5. Ka8 Nc7+ 6. Ka7 Nb5+ {perpetual check(N)}) 3... Nb6+ 4. Kd8 Nxa8 5. Kxe8 $1 $18 (5. Bxa8 $2 Nc7 6. Bb7 Ba4 7. Kc8 Bc6 8. a7 Na8 $1 9. Kb8 Nb6 $11)) 2. a8=Q Kd8 $1 (2... Kd6 3. Qa7 Nd7+ 4. Kc8 Nb5 $1 5. Qb8+ $1 (5. Qa8 $2 Nb6+ 6. Kd8 Nxa8 7. Bxa8 Nc7 8. Bb7 Ba4 9. Kc8 Bc6 10. a7 Na8 $1 11. Kb8 Nb6 $11) 5... Nxb8 6. Kxb8 $18) (2... Nxa8 3. Bxa8 Ba4 4. a7 $1 (4. Bxe4 $2 Bc6 5. Bxc6+ Kxc6 $1 6. a7 Nd7+ 7. Kc8 Nb6+ 8. Kb8 Nd7+ {perpetual check(N)}) 4... Nc6+ 5. Bxc6+ Bxc6 6. b5 $1 $18) 3. Bc6 $1 (3. Qa7 $4 Nd7#) 3... Nxa8 4. Bxa8 Nd7+ 5. Kb7 $1 {wK<->wB} (5. Ka7 $4 Kc7 $19) 5... Ba4 6. b5 $3 (6. a7 $2 Bb5 {stalemate}) 6... Bxb5 7. a7 $1 {mutual zugzwang - virtual stalemate} Bc4 ( 7... Ba4 8. Ka6 Kc7 9. Bxe4 (9. Bd5 $2 Nb6 10. a8=Q Nxa8 11. Bxa8 Bc6 12. Bxc6 Kxc6 $11) 9... Nb6 10. a8=Q Nxa8 11. Bxa8 Bc6 (11... Kd6 12. Be4 $18 (12. Ka5 $2 Bd7 13. Be4 Bf5 $11)) 12. Bxc6 Kxc6 13. Ka5 Kc5 14. Ka4 Kc4 15. Ka3 Kc5 16. Kb3 $18) 8. Kc6 Bd5+ $1 9. Kxd5 Nb6+ 10. Ke6 $1 (10. Kxe4 $2 Nxa8 $11) 10... Nxa8 11. Kf7 1-0