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Hitech (Computer) vs Sergey Gennadyevich Kudrin
Chicago Nat-open (1988), rd 4
Sicilian Defense: Old Sicilian. Open (B32)  ·  0-1


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sac: 30...Rxa2+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Premium Chessgames Member
  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.

Premium Chessgames Member
  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.

Premium Chessgames Member
  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.

Premium Chessgames Member
  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.

Premium Chessgames Member
  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!

Premium Chessgames Member
  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>

Game Over!


<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.
Premium Chessgames Member
  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.
Nice puzzle.
Premium Chessgames Member
  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


Premium Chessgames Member
  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...

Premium Chessgames Member
  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.

Premium Chessgames Member
  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
Premium Chessgames Member
  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>
Premium Chessgames Member
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Premium Chessgames Member
  chrisowen: am cools core 30Rxa2+ da house ables am deo meo code abode by dote ables am dote ever doffer a7 doge off affables am an do heap ide over okey doke bid dole mode node as am dope quored it off as have over rode bid dose vet ables am dote bid dove woed it edict have bid devour a7 doges as act at ash aim by ace add go aer aid by ack all co vetter i alm ape at are vet as ate act awe axe ave aid ash amp aorta aeon flux a cut i curry favour ave ado vim afford agile ko ala vs am ja good tree house add old quash am road tao avowed it eddy am waves am biff buff buff e5 fable give aether bad be affable by fade baffle a7 go build a8 archmarch as have you bashed it now as have facet flubb ive flab able baste lips e5 trade checks top i g2 agog ive agile lady ahead fase back buffet affable fabs aid ave i 31.Kxa2 Ra8+ deffi am archmarch as you have acutehead i vet by 32.Kb2 Be5+ dash ebbers am fleet of foot eggers am male victor glide good eelers able eggers all as over at moon it now as have bid eel 33.Nxe5 Qxg2+ agiled it eddy am wave as am good god gleam at gab as gob hacks off chooses kim of judge bish e5 palm code lady am gum i g2 agile votes cask head ive chases ok chips kit now as have bash da jest e5 ebbers eelers am fleet of foot jas hip dark dock as victor a7 glides affables am dupe fled it edict have cog hosh as wash am buckle a7 veer at agileoff as las hip am as heat ables core coal come rich cosier doth rock bell oose goth higgeldy piggeldy am costead ja i a2 hatchet ramble give its hold aves craves house wads as wallows beth am messibles eg mid dip dive phase raves am dupe fled it eddy am wave bid dog hit edict have i a2 able this vs bath am disc wads recludes as las hip fetish a7 could evade ram rook aid dark dock at i a2 ramble gives hah victor as trade by a8 archmarch check i b2 bless am bish e5 check ebbers am fleet of foot e5 trade at heads top i g2 gyrates ave im as lady ahead chef blip dome vim come midversity ramble give ya black over yeld do deft back ukelele a8 bash ave aggregates hah agog quip jaffa bled it edict have v ate bid devour rides afar ave i a2 fag fog high as mall am yikes hide wish a7 pile by am dark dock do deft at a2 bad rumbago a8 i b2s ables hah bish e5 trades top i g2 gyrates ave im agile bid deads hive at a2 bash ha lush leash hull hall ables hads am well ash am vote fret ate mash tier raid mid jag dame came as top i g2 gyrates ball ive e4 it edict have agile lady ahead;
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.
Premium Chessgames Member
  RandomVisitor: This game was played in 1988. From

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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