www.arves.org - Ekaterinenburg 300

For the Ural city Ekaterinenburg 300 the awarded studies are:

[Event "1.p Ekaterinburg-300"] [Site ""] [Date "2023"] [Round ""] [White "S. Osintsev"] [Black ""] [Result "1/2-1/2"] [SetUp "1"] [FEN "8/1k6/2q5/8/8/K1p3p1/5N2/Q7 w - - 0 1"] [PlyCount "36"] [EventDate "2023"] 
 1. Qb1+ Ka8 $1 (1... Kc7 2. Qh7+ Qd7 3. Qxd7+ Kxd7 4. Nh3 $1 $11) (1... Kc8 2. Qf5+ $11) 2. Nd3 $1 {The c-pawn is much more dangerous.} ({Try} 2. Nh3 $2 c2 $1 ({Not} 2... Qa6+ $2 3. Kb3 Qb5+ 4. Kc2 (4. Ka2 $4 Qa4#) 4... Qf5+ 5. Kc1 Qf1+ 6. Kc2 Qxh3 7. Qa2+ $11 {perpetual check}) 3. Qc1 Qc3+ $1 4. Ka2 g2 5. Ng1 { White blocked the passed pawns, but...} Ka7 $1 {Zugzwang!} 6. Ne2 Qc4+ 7. Kb2 Qxe2 $19) 2... c2 (2... g2 3. Qg1 $1 Qb7 4. Nc5 $1 Qb2+ 5. Ka4 $11) (2... Qa6+ 3. Kb3 Qb6+ 4. Nb4 $11) 3. Qf1 $1 {The Knight needs protection} ({Try} 3. Qe1 $2 Qa6+ ({Not} 3... g2 $2 4. Qa5+ Kb7 5. Qb4+ Ka6 6. Nc5+ Ka7 7. Qa5+ Kb8 $11) 4. Kb4 Qxd3 $19) 3... Qc3+ (3... g2 4. Qf8+ $11 {perpetual check}) 4. Ka2 $1 ({ Not} 4. Ka4 $2 Qc4+ 5. Ka5 Qa2+ $1 6. Kb6 Qb1+ $19) 4... Qxd3 $1 { It turns out that the Knight is not protected!} 5. Qf8+ $1 {The balance of forces is in favor of Black, White is counting on perpetual check} ({ Black Queen is indirectly protected by a fork} 5. Qxd3 $2 c1=N+ $1 $19) 5... Ka7 6. Qc5+ $1 ({Try} 6. Qe7+ $2 Ka6 7. Qe6+ Kb5 8. Qe5+ Kb4 9. Qb8+ Kc3 10. Qe5+ Kd2 $19 {The Black King escaped the chase}) 6... Kb7 7. Qb4+ Ka6 8. Qa4+ Kb6 9. Qb4+ Ka7 10. Qc5+ Ka6 $1 11. Qc6+ Ka5 {The Black King is trying to escape from checks under the protection of his Queen, but...} 12. Qc3+ $3 ({ Thematic try} 12. Qc5+ $2 Qb5 {Position A} 13. Qc3+ (13. Qc7+ Kb4 $1 14. Qf4+ Qc4+ $1 $19 {counter check!}) 13... Kb6 $1 (13... Ka6 $2 14. Qc8+ Ka7 15. Qc7+ Qb7 16. Qc5+ Ka8 17. Qf8+ Qb8 18. Qf3+ Qb7 19. Qf8+ $1 $11 {perpetual check}) 14. Qf6+ Qc6 $1 15. Qb2+ Ka7 ({waste of time} 15... Qb5 16. Qf6+ Qc6) ({or}  15... Kc7 16. Qg7+ Kb6) 16. Qd4+ Ka8 $3 { The Black King retreats, only to return later!} 17. Qd8+ Kb7 $1 18. Qe7+ Qc7 $1 19. Qe4+ Kb6 $1 20. Qe6+ Kc5 $1 21. Qe3+ Kc4 $1 22. Qe4+ Kb5 23. Qd5+ Qc5 $1 $19 { Position A1 echo chameleon - the pieces have moved one vertical to the right!}) 12... Ka4 (12... Qxc3 $11 {stalemate}) 13. Qd4+ $3 ({Not} 13. Qc6+ $2 Kb4 $1 $19) 13... Ka5 (13... Qxd4 $11 {model mirror stalemate}) 14. Qc3+ Kb6 15. Qb4+ Kc6 16. Qc3+ $1 Kb7 17. Qb4+ Kc8 {The Black King makes an attempt to cross the c-file, otherwise there is a perpetual check.} 18. Qc3+ $1 Qxc3 $11 { model mirror stalemate} 1/2-1/2

[Event "5.hm Ekaterinburg-300"] [Site ""] [Date "2023"] [Round ""] [White "M. Hlinka & L. Kekely"] [Black ""] [Result "1/2-1/2"] [SetUp "1"] [FEN "3NR3/6k1/4P3/p7/K7/2r4p/8/4n3 w - - 0 1"] [PlyCount "29"] [EventDate "2023"] 
 1. Re7+ $1 (1. Nf7 $2 Nc2 $1 2. Nd6 Nd4 3. Re7+ Kg6 4. Re8 h2 5. Rh8 Rc2 6. Kxa5 (6. e7 Ra2#) 6... Kg5 7. Ne4+ Kg4 8. Nf6+ Kf3 $19) 1... Kg6 2. Rb7 $1 (2. Rd7 $2 Re3 3. e7 Kf6 4. e8=Q Rxe8 5. Rh7 Re3 $19) ({try} 2. Ra7 $2 Rc4+ 3. Kxa5 h2 4. e7 Rc5+ 5. Kb4 (5. Kb6 Re5 $19) 5... Re5 6. Ra6+ Kg7 7. Ne6+ Kf7 8. Nd8+ Kxe7 9. Rh6 Re4+ 10. Kc3 Nf3 $19) 2... h2 (2... Re3 3. e7 Re4+ 4. Kxa5 Re5+ 5. Ka6 $1 $11 (5. Kb4 $2 h2 $19 {as in try})) 3. e7 Re3 4. Rb6+ Kg7 5. Ne6+ Kf7 6. Ng5+ Kxe7 7. Rh6 Re2 8. Kxa5 Rg2 $1 (8... Kf8 9. Ne6+ $1 Kf7 10. Nd4 $1 Rb2 11. Ka4 $11) 9. Ka4 $1 (9. Kb4 $2 Nd3+ 10. Kc3 Nf2 $19) 9... Kf8 10. Ne6+ Kf7 11. Nd4 Rf2 12. Kb3 Nf3 (12... Nd3 13. Nf3 Rxf3 14. Rxh2 $11) 13. Nxf3 { draw, for example} Rxf3+ 14. Kc2 Rf2+ 15. Kd3 $11 { Joint efforts white the figures all the same detain a pawn and are rescueed.} 1/2-1/2

[Event "sp.hm Ekaterinburg-300"] [Site ""] [Date "2023"] [Round ""] [White "M. Hlinka & L. Kekely"] [Black ""] [Result "1/2-1/2"] [SetUp "1"] [FEN "4B3/r5p1/7p/8/1B5P/8/1p4P1/1k1K4 w - - 0 1"] [PlyCount "27"] [EventDate "2022"] 
 1. Bg6+ (1. h5 $2 Ra6 2. Bb5 Ra8 3. Bd3+ Ka2 4. Bc3 Rd8 5. Ke2 Rxd3 6. Bxb2 Rd7 7. Bc3 Kb3 8. Ba1 Kc2 $19) 1... Ka2 2. h5 $1 Ra6 (2... Rb7 3. Bf8 b1=Q+ 4. Bxb1+ Kxb1 5. Ke2 Kc2 6. g4 Rf7 7. Bd6 $1 Kb3 (7... Rf6 8. Bc7 Re6+ 9. Kf3 Kd3 10. g5 $1 hxg5 11. Kg4 $11) 8. Ke3 $11) 3. Bf7+ Kb1 4. Bd5 Ra7 (4... Ra4 5. Bc3 Ra7 6. Be6 $1 Re7 7. Bf5+ Ka2 8. Kd2 Rd7+ 9. Ke3 Re7+ 10. Kd2 $1 $11) 5. Be4+ ( 5. Bg8 $2 Rc7 $1 6. Bh7+ Ka2 7. Kd2 Rc4 8. Bc3 Rg4 $19) 5... Ka2 6. Bg6 (6. Bd5+ $2 Ka1 7. Bc3 Rd7 8. Kc2 Rc7 9. Be4 Ka2 10. Kd2 Rd7+ 11. Ke3 Re7 12. Kf3 Kb3 13. Bd4 Rxe4 14. Bxb2 Re7 15. Ba1 Kc2 $19) (6. Kd2 $2 Kb3 7. Bf8 Rd7+ 8. Ke3 Rc7 9. Bh7 g5 10. Bg6 Rc2 11. Bf7+ Ka4 12. Ba2 Rc1 13. Bg7 Ka3 14. Bxb2+ Kxb2 $19) 6... Ra6 (6... b1=Q+ 7. Bxb1+ Kxb1 8. Ke2 Rb7 9. Bf8 Kc2 10. g4 Rf7 11. Bd6 $11) (6... Kb3 7. Bf8 $1 Kc3 8. Ke2 $11) (6... Rb7 7. Bf8 $1 b1=Q+ 8. Bxb1+ Kxb1 9. Ke2 Kc2 10. g4 Rf7 11. Bd6) (6... Rd7+ 7. Ke2 Rd5 8. Bc3 $1 $11) 7. Bf7+ Kb1 (7... Ka1 8. Bc3 $11) 8. Bd5 (8. Bc4 $2 Ra4 $19) (8. Bg8 $2 Rc6 9. Bf8 Rc1+ 10. Ke2 Rc2+ 11. Kf3 Kc1 12. Ba2 Rc7 13. Kg4 (13. Ba3 Rc3+ $19) 13... Ra7 $19) 8... Ra4 9. Bc3 Ra7 10. Be6 $1 (10. Be4+ $2 Ka2 $1 11. Bd5+ Ka3 12. Be4 Kb3 $19) 10... Re7 11. Bf5+ Ka2 12. Kd2 $1 (12. Bg6 $2 Rd7+ 13. Ke2 Kb3 $19 ) 12... Rd7+ 13. Ke3 Re7+ 14. Kd2 {positional draw. Already after the second (!) move before us surprising position of dynamic balance with mutual maneuvering.} 1/2-1/2