Problem p57842
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Technical Merit
Rating1634.4
RD4.9
To Play
Statereleased
 
Artistic Impression
Star Rating3.0
Stars
Votes4

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Star Ratings
DateTacticianRatingStars
2008-10-24 14:05:21moegigo1492
2010-08-21 21:10:35mazette1363
2011-06-25 15:42:4710101662
2012-05-29 06:36:30Garryback1679

Comments
DateTacticianRatingComment
2008-10-24 14:05:21moegigo1492strange for me. 
2009-07-12 08:12:35Garryback1679I would like to meet someone to find such moves in blitz - it has to be world champion or uri spam Garryback 
2009-10-27 18:34:35UriBlass2002The logic is simple your queen is under threat so you need to threat the opponent queen when you reply to check. You do not need to be a world champion for it(fide rating of less than 2100 can be clearly enough in part of the cases). 
2010-08-21 21:10:35mazette1363Yes, simple enough... once you see that your king is in check. 
2011-06-25 15:42:47101016621...Qb7+ is a discovery. It is not so surprising. 

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Crafty 19.19 3GHZ 5sec

1. ... Qb7+
2. Be4
({12:+3.32} 2. Be4 Rxc5 3. Bxb7 Rc7 4. Ba6 d5 5. Bd4 f6 6. Bd3 fxe5 7. fxe5 Rb8 8. Nd2 $18)
({12:-1.18} 2. Kg3 Rxc5 3. Bxc5 Rc8 4. Bb4 Qb6 5. Bb5 Qd4 6. Kg2 d5 7. Bxe8 Rxe8 8. Bd6 $17)
2. ... Qb2+
3. Rf2
({12:+4.09} 3. Rf2 Qxf2+ 4. Bxf2 Rxc5 5. Bxc5 a6 6. Bd3 Rc8 7. Na4 a5 8. Bb6 Ra8 9. Bc5 $18)
({12:-0.83} 3. Kg1 Rxc5 4. Bxc5 Qb8 5. Rd1 d5 6. exd6 Nxd6 7. Bg2 Qc7 8. Ne4 Nb7 9. Rxd8+ Nxd8 10. Nbc3 $17)