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Group 10 "Three leap while one sleeps"

P10.1.1 P10.1.2 P10.2.1.1

Reader's Challenge P10.1.1

Motwani,P - Bathie,N Scottish Championship, 1999.










Black rejected 13...0-0?, but why?
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Reader's Challenge P10.1.2

Motwani,P - Bathie,N Scottish Championship, 1999










Starting at move 40, can you find a way for White to FORCE checkmate not later than move 42?
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Reader's Challenge P10.2.1.1

Nouro,M - Lugovoi,A [C46] Finland 1999.










In the actual game, Black lost quickly after 16...Ke8 17 Nxg7+, but can you demonstrate winning lines for White after 16...Kf8 or 16...Kf6, with the latter case being particularly neat?
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Solutions

Solution to P10.1.1

Motwani,P - Bathie,N Scottish Championship, 1999










13...0-0? loses a pawn to 14 h3 Nf6 15 Bxh6! gxh6 16 Rxf6.
P10.1.1 P10.1.2 P10.2.1.1

Solution to P10.1.2

Motwani,P - Bathie,N Scottish Championship 1999.










40 Rd4 threatens 41 Ra3#, and the longest line for Black is 40...Nc3 (40...Nxd6 allows 41 Bd2#) 41 Ra3+ Na4 42 Raxa4#. Alternative solutions include 40 Nc4+ Ka4 41 Rdb1 followed by 42 Ra3# or 42 Rb4#, and in this line White might also choose 41 a3 (menacing 42 Rb4#) 41...a5 42 Nb2# or 42 Nxb6#.
P10.1.1 P10.1.2 P10.2.1.1

Solution to P10.2.1.1

Nouro,M - Lugovoi,A [C46] Finland, 1999










16...Kf8 loses because of 17 Bd6+ Kg8 18 Ne7+ Kf8 19 Nc8+ and 20 Nxb6 or 18...Kh7 19 Bd3+ f5 20 Bxf5#, and 16...Kf6 also walks into a pretty mate: 17 Rd6+! Kxf5 18 Bd3+ Kg4 19 h3+ Kh5 20 Be2+ g4 21 hxg4++ Kg5 22 f4#.
P10.1.1 P10.1.2 P10.2.1.1