[Event "Bron-110 MT "] [White "Rusz, Árpád"] [Black "(Study 171)"] [Site ""] [Round ""] [Annotator ""] [Result "1-0"] [Date "2019.??.??"] [PlyCount "17"] [Setup "1"] [FEN "R2B4/4P3/5Q2/pB6/5n2/6q1/1K1k1r2/n7 w - - 0 1"] 1. Bxa5+ (1. e8=Q Qb3+ (1... Kd1+ 2. Be2+ )2. Kxa1 Qd1+ 3. Kb2 (3. Ka2 Kc1+ )Qc2+ 4. Ka1 Qd1+ {perpetual check} )Kd1+ (1... Ke3+ 2. Ka3 Nc2+ 3. Ka4 )2. Bd2 {unguarded guard sacrifice} (2. Kxa1 {is wrong because the a8 rook doesn't protect the a3 square.} Qa3+ )Nd3+ (2... Rxd2+ 3. Kxa1 {After the bishop sacrifice, the a3 square is protected.} Qa3+ 4. Rxa3 )3. Bxd3 Rxd2+ (3... Rxf6 4. e8=Q )4. Kb1 (4. Kxa1 Qxd3 {mutual zugzwang. Paradoxically, it will be bad for white that the pawn is going to be promoted!} 5. e8=Q (5. Ra2 Rxa2+ 6. Kxa2 Qd5+ 7. Ka3 Qa5+ 8. Kb3 Qb5+ 9. Kc3 Qc5+ 10. Kd3 Qc2+ 11. Ke3 Qc3+ 12. Qxc3 {stalemate} )Qc3+ 6. Qxc3 Ra2+ 7. Kb1 (7. Rxa2 {stalemate} )(7. Kxa2 {stalemate} )Rb2+ 8. Ka1 Ra2+ {perpetual check/stalemate} )Qxd3+ 5. Kxa1 {mutual zugzwang} Rc2 (5... Ra2+ 6. Kxa2 (6. Rxa2 Qc3+ 7. Rb2 (7. Qxc3 {stalemate} )Qxf6 8. e8=Q Qa6+ 9. Kb1 Qd3+ 10. Ka2 Qa6+ 11. Kb3 Qb6+ 12. Ka3 Qe3+ 13. Qxe3 {stalemate} )Qd5+ 7. Kb2 )6. Rd8 Rc1+ 7. Ka2 Rc2+ 8. Qb2 Rxb2+ 9. Kxb2 1-0