Problem p13508
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To Play
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Star Rating2.8

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2007-01-30 23:56:00abcpatzer1476
2008-05-06 23:19:59midn1ght1605
2010-07-25 14:58:00JHarrison1509
2010-12-07 21:39:45mtracey1533
2011-04-27 08:05:42Freeze1502
2011-10-19 05:37:55javierbrindis1085
2012-01-16 11:40:32MaltaCross1278
2012-04-06 23:47:51mtal611558
2012-04-14 13:32:05finnegan1187
2012-05-17 20:55:36ptysio1025
2014-04-17 22:26:14nune1570
2017-05-17 15:56:08evanhao1552

2007-01-30 23:56:00abcpatzer14762 Qxf7+ is much stronger, instead of winning a rook it wins the king. 
2008-05-06 23:19:59midn1ght1605abcpatzer: except 2...Kh8 spoils that. Crafty's not wrong about tactics very often! 
2009-12-05 10:58:52Garryback1679I had the same failing idea of Qxf7 
2010-12-07 21:39:45mtracey1533Also fell for 2 Qxf7+ :( 
2010-12-26 17:32:53mtal611558ok,crafty solution 2)Rxd8 seems simple clearcut and winning hands down,but for the life of me I can't see anything wrong with 2) Qf7+...Kh8,3) Rxd8,oh hang on a sec!!,after 3)...Rxd8,white not only passes up winning a piece,there's no mate either after 4) Qe8+...Rxe8,5)Rxe8+...Ng8 and black wins.A very deceptive puzzle which is way underrated at 1453.Nah..that's an excuse,Tal my foot!!!-NEVER EVER...  
2012-01-16 11:40:32MaltaCross12783.Rxd8 wins a tempo because it leads to the check 4.Rxf8+. It is because of this tempo that White wins material. 
2012-04-06 23:47:51mtal611558got this right again,but it cost me some time and points trying to decide between two lines of play.Quickly spotted the schwizenzug idea winning material but too be honest I felt a strong pull towards the cute mating idea only to notice at the last second the knight moving backwards to block the check after I'd already sac'ked my Q.That was close,thin dividing line between winning and losing eh lol 
2012-04-14 13:32:05finnegan1187Qxf7 is better 
2013-10-12 19:38:28mtracey15333 years later, still fell for 2 Qxf7 
2014-01-18 07:58:36midn1ght1605Ok, let's be clear. Black's first move is 1...Nxd4?. White must reply 2.Rxd4. Now if 2...Qxc5??, 3.Rxd8 wins cleanly (Rxd8 Qxf7+). Whereas 3.Qxf7? does not win immediately due to 3...Kh8. @abcpatzer started the wrong move numbering (but I continued it!) 
2014-01-18 11:19:35floreatdunum1702Important point to note is that the White king is on h1, g1. Therefore Qxf2 is not check, allowing White to play Rxf8, before recapturing the queen. 
2017-05-17 15:57:15evanhao1552I saw that Qxf7+ doesn't work so I did RxN. 

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Crafty 19.19 3GHZ 5sec

1. ... Nxd4
2. Rxd4
({11:+3.71} 2. Rxd4 Rxd4 3. Qxd4 Rc8 4. b4 Qc7 5. e5 Nd5 6. Qe4 g6 7. Bd3 Nc3 $18)
({11:-0.81} 2. Nb3 Nec6 3. e5 f6 4. Nxd4 Nxd4 5. Qh4 f5 6. b4 a4 7. Rf4 Ne2 $17)
2. ... Qxc5
3. Rxd8
({13:+5.97} 3. Rxd8 Qxf2 4. Rxf8+ Kxf8 5. Rxf2 Nc6 6. Rc2 Nd4 7. Rc5 f6 8. Bd3 a4 9. Kg1 Kf7 10. Bxb5 Nxb5 11. Rxb5 $18)
({12:+0.35} 3. Qxf7+ Kh8 4. Rxd8 Rxd8 5. Qxe6 Qf2 6. Rg1 Ng8 7. Qa6 Qxb2 8. Qxa5 Rd2 9. Qb4 Qxb4 10. axb4 $14)