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|Nov-05-05|| ||KingG: Obviously you can't solve this in a 0.2 seconds, but considering the previous problems this week, a natural move to consider was 30...Rxa2+. The rest really isn't that difficult as long as you've noticed the pin on the queen.|
Also, <LMAJ>, i think most people work from the diagram. What would be the point of setting it up on a board and moving the pieces, this won't help you in a real game.
|Nov-05-05|| ||Saruman: I find that solving these puzzles is much easier than during competition. Often I am just too nervous while playing in tournaments.|
|Nov-05-05|| ||LIFE Master AJ: <Saruman>
Agreed. It can be very difficult to think in a competition. Noise, the constant ticking of clock, spectators hovering over the board... any one of a number of factors can combine to cloud your judgement or make clear thought nearly impossible.
Its one of the reasons I try to be lenient when a GM makes a mistake. Most of us are playing for fun, but his whole livlihood may be at stake.
|Jul-19-08|| ||The Ninth Pawn: From Game Collection: The Ninth Pawn's Chess Course :|
In Hitech vs Kudrin, 1988 , Black uses the idea of a DECOY FOR TEMPO (check) by 30. ... ♖a7x♙a2+! which leads to material gains. In return for the rook, Black gets his other rook to a8 and an extra move in hand.
|Apr-07-16|| ||Penguincw: Happy International Health Day.
Yay! Nice to see a new puzzle. Well, technically not new, but it hasn't been a POTD for 10 years. I don't why the position looks familiar though.
Anyway, I got 30...Rxa2+ 31.Kxa2 Ra8+ 32.Kb2, and was just kinda stuck there.
|Apr-07-16|| ||patzer2: For today's Thursday puzzle, an alternative win is 30...Be5+ 31. Kc1 Qf4+ 32. Rd2 Rxa2+ 33. Kd1 Ra1+ (-5.42 @ 20 depth, Deep Fritz 15).|
White's game takes a turn for the worse with 17. Qe3 Bxb3 (-0.47 @ 19 depth, Deep Fritz 15). Instead, 17. Kb1 (=0.57 @ 25 depth, Komdo 9.02) leaves White with the advantage.
|Apr-07-16|| ||agb2002: Black has a bishop for a knight.
White threatens 31.Rxe4.
Black can attack the white king with four pieces. This suggests 30... Rxa2+:
A) 31.Kxa2 Ra8+ 32.Kb2 Be5+
A.1) 33.Nxe5 Qxg2+ wins decisive material.
A.2) 33.Kc1 Ra1+ 34.Kd2 Ra2+ 35.Kc1 Bf4+ 36.N(Q,R)d2 (36.Re3 Bxe3+ just loses a rook) 36... Qc2#.
A.3) 33.Nd4 Qxg2+ as A.1.
A.4) 33.Rd4 Bxd4+ 34.Kc1 Ra1+ 35.Kd2 Ra2+ 36.Kc1 (36.Kd1 Qb1#) 36... Be3+ 37.Rxe3 Qxe3+ wins also the queen.
B) 31.Kc3 Be5+ (31... Rxg2 32.Rxe4 Bxg5 33.Nxg5 Rxg5 34.Rxe7 with chances for White)
B.1) 32.Kb4 Qb7#.
B.2) 32.Nxe5 Qxg2 - + [Q+P vs N].
B.3) 32.Nd4 Qxg2 - + [Q+B+P vs N].
B.4) 32.Rd4 Bxd4+ wins decisive material.
|Apr-07-16|| ||diagonalley: 30.... RxRP+ is an obvious try and as soon as one spots that the enemy Q is unsupported the rest follows. quite easy for a thursday :-)|
|Apr-07-16|| ||Prosperus: Is another move order also possible?
30. ... Be5+ 31. Kc1 (31. Nxe5 Qxg2) Rxc4+ 32. bxc4 (32. Kd2 Rc2#) Qxc4+ 33. Qc2!
|Apr-07-16|| ||gofer: Black has a strong attack with control of three diagonals, but that isn't
quite enough to finish white off. Black needs to bring one of its rooks
into play (it doesn't matter which really) and at that point the attack
will succeed. The rook re-loader gives black that extra open line to
the vunerable king and that is enough to win...
<30 ... Rxa2+>
31 Kc3 Be5
32 Nxe5 Qxg2
<31 Kxa2 Ra8+>
<32 Kb2 Be5+>
33 Nxe5 Qxg2
33 Kc1 Ra1+
34 Kd2 Ra2+
35 Kc1 Bf4+
36 Re3 Bxe3+
37 Rd2/Nd2/Qd2 Qc2#
<33 Rd4 Bxd4+>
34 Nxe5 Qxg2
<34 Kc1 Ra1+>
<35 Kd2 Ra2+>
Black doesn't allow the king to escape via c3 and b4.
36 Kd1 Qb1#
<36 Kc1 Be3+>
37 Nd2/Qd2 Qc2#
37 Kd1 Qb1#
<37 Rxe3 Qxd3+>
click for larger view
38 Nd2 Qe1#
38 Kd1/Kb1 Rxg2 mating soon
<38 Qd2 Rxd2>
<Prosperus: Is another move order also possible?>
I looked at this line too before finding the easier win, which is the one everyone else has found.
The interesting point is that perhaps black may be able to reach this
position which may even be okay for black - even being a rook down...
click for larger view
|Apr-07-16|| ||Coriolis: I find it quite amusing that a computer resigned.|
|Apr-07-16|| ||alphee: Due to the attack on its Queen, black has to option: save the Queen or chase the king with moves delivering checks all the time until check-mate turns up.
That's what 30 ... ♖xa2+ does.
|Apr-07-16|| ||morfishine: The key is noticing Black has Be5+ exploiting the pin on the Knight; 30...Rxa2+ is the most forcing setting up 32...Be5+, but the immediate 30...Be5+ wins too|
|Apr-07-16|| ||CHESSTTCAMPS: In this middle-game attacking position, black has a bishop for a knight (in an open position where it is much stronger) and a much more secure king position. White threatens 31.Rxe4, but that should not displace the queen from her powerful outpost.|
30.... Be5+! launches the finishing king hunt.
A. 31.Nxe5 (or Nd4) Qxg2+ wins
B. 31.Kf1 Rxc4+! 32.bxc4 Qxc4+ 33.Qc2 Bf4+ 34.Rd2 Bxd2+ 35.Kxd2 Rxa2 36.Qxa2 Qxa2+ with Q+3 pawns (including 2 connected passed pawns) for R+N, a massive advantage.
B.1 32.Kd2 Rc2#
B.2 33.Kb1 Rb7+ 34.Qb2 Rxb2+ 35.Ka1 Re2+ 36.Kb1 Qb2#
B.3 33.Kd2 Rxa2+ 34.Ke3 Bf4#
B.4 34.Kb1 Rb7+ forces mate in 3.
C. 31.Rd4 Bxd4+ wins a rook with a quick finish in view.
Time for review...
|Apr-07-16|| ||offramp: In those days computers did not resign. It's operator would resign on the computer's behalf. |
If the operator was not available then the opponent would do it.
|Apr-07-16|| ||CHESSTTCAMPS: Hmmm, for some reason, the possibilities of 34.Nd2 or 35.Nxd2 did not occur to me in line B.|
|Apr-07-16|| ||lentil: I actually got this one|
|Apr-07-16|| ||whiteshark: What a wonderful move! ♔ on the rim...|
|Apr-07-16|| ||leRevenant: <lentil: I actually got this one>
Me too; I solved today's POTD after failing 3 times previously this week.|
|Apr-07-16|| ||garrido: ♖xa2+ and winner <very easy>|
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|Apr-07-16|| ||dfcx: 30...Rxa2+ is easy to spot. After 31.Kxa2 black has two choices, Qa8+ and Ra8+. Qa8+ allows white king to escape to b1, this leaves us with 31...Ra1+. Now the rest are easy.|
30...Rxa2+ 31.Kxa2 Ra8+ 32.Kb2 Be5+
Here white has to give up its queen to avoid mate.
A. 34.Nxe5 Qxg2+ 35.Kc3 dxe5
B. 33.Kc1 Ra1+ 34.Kd2 Ra2+ 35.Kc1 Bf4+ 35.Re3 Bxe3+ and Qc2# next.
|Apr-07-16|| ||Cheapo by the Dozen: Ack. I overlooked that the knight was pinned against an undefended queen.|
|Apr-07-16|| ||RandomVisitor: This game was played in 1988. From chess.com:
In 1988 HITECH won the Pennsylvania State Chess Championship after defeating International Master Ed Formanek (2485). HITECH defeated Grandmaster Arnold Denker in a match. HITECH became the first chess computer to be rated Grandmaster strength.
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