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Conrad Holt vs Magesh Chandran Panchanathan
Berkeley International (2011), Berkeley, CA USA, rd 2, Jan-02
Nimzo-Indian Defense: Classical Variation (E32)  ·  0-1



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Given 16 times; par: 44 [what's this?]

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sac: 29...Rxb7 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Mar-24-11  TheTamale: Fascinating and good.
Mar-24-11  Patriot: Correction: Instead of line C, it should be a different variation replacing 30.Rxe4?. It should start with 30.Re1.
Mar-24-11  Marmot PFL: Instructive mating line w R + N vs WK trapped by its own pawns, but not too hard to find.
Mar-24-11  cyclon: What quite straight line emerges to my "sight" relatively soon from this position is; 29.-Rxb7 30.Rxb7 (What else? Any suggestions?) -Rd1+ 31.Kh2 Ng4+ 32.Kh3 Nxf2+ 33.Kh2 (Kh4 Rh1X) Ng4+ and now the whole rook falls leaving Black healthy piece up. Therefore already after 29.-Rxb7 Black can little by little start to close his cufflinks. But maybe there's something more, who knows.
Mar-24-11  cyclon: Yes, there was something more. Instead of my proposal 33.-Ng4+ there is -Rh1X. Such is Chess. One can miss a one-move mate, but might find a mating continuation from the position where there doesn't seem to be one at first glance.
Premium Chessgames Member
  beenthere240: <smitha1> I don't especially want to be playing black after 33. ...Nxe3 34. fxe3. My king is out of play, I might be able to win the e pawn but if white gets the a pawn going, I'm toast. White can put his pawn behind my epawn, and if the king gets out and wins the epawn I'm lost. So I susptect that winning the rook instead of mating the king is stupidistic, not sadistic.
Premium Chessgames Member
  kevin86: I saw this one from the start-exchange sac,rook check,fork and regain of exchange. Then I saw something better:the combination of white's doubled pawn,black's pawn,and the knight block white's egress to the g-file so Rh1 IS MATE.
Mar-24-11  YouRang: Got it. I first noticed the potential of a K+R knight fork after ...Ng4, if I can force the K to h2 -- and of course I can with the exchange sac: 29...Rxb7!

30.Rxb7 <leaving back rank unguarded> Rd1+

31.Kh2 <and now the fork> Ng4+

32.Kh3 <forced>

Calculating this position, I didn't see much to say for 32...Nxe3 except that I get back the exchange. Black still has a probably losing game considering white's outside passed pawn.

So, I considered another forcing move: 32...Nxf2+! giving check and conveniently guarding h1 and g4. And I didn't have to think long to realize that this was the solution:

33.Kh2 Rh1# -or- 33.Kh4 Rh1# (thanks to the pawn closing g5).

One has to be impressed with the resourcefulness of this knight, at once giving check and blocking all the escapes.

Mar-24-11  stst: 29.. .. RxN
30.RxR Rd1+
31.Kh2 Ng4+
32.Kh3 Nxf2+
33.Kh4* Rh1#

* WK cannot back down to h2, or BkRh1#

BUT, in case W does not take the Bk R after
29..... RxN
30.Rc8 then Bk can double up R with Rd7
31.Re1 Ng4 attacking f2
if 32.Re2 Rd1+ and repeat the feat in above line;
if 32.Rf1 Rd3 attacking the aP and paves way to advance the eP.

Premium Chessgames Member
  Penguincw: Well,didn't get that right.
Mar-24-11  redorc19: hey can someone with fritz tell me how to copy and paste a line or variation from Fritz's analysis (or) a variation you played through the engine? It would help with showing a line which I found.
Mar-24-11  David2009: C Holt vs M Panchanathan, 2011 Black 29...?

29...Ng4 creates back rank mate threats and pressurises Black : if 30 Rxe4 Rxb7! 31 Rb4 Rxb4 32 axb4 should win for Black. Instead 30 Re1 Rxa3 picks up a Pawn, since 31 Rxe4 Rb3 again wins a N. Time to check:
Missed it. Have I found a second-best line? Time to set the problem up in Crafty End Game Trainer and find out. Here's the puzzle position colours reversed to gether with a Crafty EGT link.

click for larger view

29...Ng4? loses Black's entire advantage to 30 Reb3!. Perhaps the best Black can now hope for is to bail out into a probably drawn ending with 30...Kh7. The game could continue 31.f3 Nf6 32.Re1 Rd3 33.Rxd3 exd3 34.Nc5 Rxa3 35.Rd1 Ra5 36.Nxd3 when White remains a Pawn ahead but it is doubled and all the Pawns are on one side.

Premium Chessgames Member
  ajk68: Is 27. Nxb7 where white went wrong?
Is 27. Nxe4 better?
Premium Chessgames Member
  perfidious: <ajk68> 27.Nxe4 is clearly stronger than the move played, but White may well have thought Black had chances to hold the position after 27....Nxe4 28.Rxe4, which is possible if the queenside pawns are swapped.
Mar-24-11  njchess: I wonder when GM Panchanathan conceived of the mating combination. I ask this question only because after 24. Nc4, much GM Panchanathan's focus appears to be on White's hapless knight, which he eventually traps.

Ra8 followed by Rb7 are masterful moves since they tie up both of White's rooks. But I wonder if he had already conceived of the back rank mate before White played 28. Re3. Either way, nicely done.

Mar-24-11  Patriot: <<redorc19>: hey can someone with fritz tell me how to copy and paste a line or variation from Fritz's analysis (or) a variation you played through the engine? It would help with showing a line which I found.>

Most of us manually key in the analysis. <wals> usually pastes computer analysis but from Rybka. I have Fritz and tried but see no way to copy variations. I would be curious if anyone knows a way to do this--it could be useful.

Here's a "trick" that I discovered recently. If you don't already know this, you may find it useful.

To get the game position in Fritz:

1. Right-click on the game board above for the position of interest, and choose <Copy Position>.

2. On the scoresheet to the right, you will notice that it now shows the "FEN" code below the information section. Right-click on the FEN code and click <Select All>.

3. The entire FEN code should now be highlighted. Right-click on it and select <Copy>.

4. Go into Fritz and choose <File|New|Position Setup>.

5. At the bottom right of the board setup, click the button <Paste FEN>.

This should paste the board position, with the correct player to move.

Mar-24-11  Mariusfj: 29...Rxb7 30 Rxb7 Rd1+ 31 Kh2 Ng4+ 32 Kh3 Nxf2+ 33 Kh4 Rh1 #

Time to check


Yes, I got it.

4 of 4 so far this week.

Mar-24-11  fouard: What a pleasant surprise to see one of Conrad's games here! Our best player in Kansas, he is still in high school, and will likely show up here many more times.
Mar-24-11  wals: Yes can claim a win for this one.

White blunder

29.Rb1, -3.35. Best,

Analysis by Rybka 4 x64: d 22 : 4 min :

1. = (0.00): 29.Rb3 Rd3 30.Rxd3 exd3[] 31.Nc5 Rxa3 32.Rd1[] d2 33.Rxd2 Ra1+ 34.Kh2[] Ng4+ 35.Kh3[] h5[] 36.Kh4[] Kh7[] 37.Rd6 Nxf2 38.Rb6 Rh1+ 39.Kg5[] Ra1 40.Ne6 Ra5+ 41.Kf4 Ra4+ 42.Kf3 Ne4[] 43.g4 hxg4+ 44.Kxg4

30.Rxb7, -#5. Best, Ree1, -3.35. or
Rbe1, -4.10.

Mar-24-11  knight knight: Ok think I've got this one after a five-minute thought - 29...Rxb7 30. Rxb7 Rd1+ 31. Kh2 Ng4+ 32. Kh3 Nxf2+! 33. Kh2/h4 Rh1#. Nice.
Mar-24-11  WhiteRook48: yes, I actually solved it! 29...Rxb7 30 Rxb7 Rd1+ 31 Kh2 Ng4+ and the threats on h1 are far too deadly for white to deal with
Premium Chessgames Member
  thegoodanarchist: got it. My skills haven't completely declined! :)
Premium Chessgames Member
  Once: <Patriot> <redorc19>

Some Fritz tricks:

To copy a position - edit-copy-copy position.

To copy the moves from a game - edit-copy-copy game

To insert analysis into a game - right click in the analysis window and then select either "copy to notation" or "copy all to notation". Then copy game as before.

To insert analysis or a position into, click in the kibitz window and press ctrl-V.

Works with Fritz 11 and on a PC. Sorry, don't speak apple!

Mar-25-11  redorc19: Thanks, <Once> <Patriot>! Lots of help from both of you!
Jun-27-15  jith1207: <njchess> Good question, I think the answer to your question is in the order of moves played in the game itself!

Black could have trapped White's Knight by simply playing Rb8 rather than Ra8. The point of Ra8 being to move one of the two white's back rank rooks to Re3 to defend the lonely white pawn in the 'a' Rank. Then, play Ra7 to attract the other white rook to defend knight and eventually accept Black's rook sacrifice. That makes the White's back rank empty with no defenders with black knight perfectly placed to play the mating dance!

Am glad to have found this gem of a game.

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