We must play forward with patience.

mattenklopper = carpet beater (English)

<It is used in the James Bond novel Casino Royale as a torture device. In the film, a knotted rope is used. In either case, Bond's enemy, Le Chiffre, uses the instrument to try to force information out of Bond by striking him repeatedly in the testicles.>

The World - Gert Jan Timmerman, Chessgames Challenge 2007 java

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Analysis by Fruit 2.3.1 (25-ply):

1. (0.63): 38.h4 Ra6 39.Rb1 Kf6 40.Kf1 Ke6 41.Rcc1 Kd6 42.Ke2 c5 43.h5 c4 44.hxg6 hxg6 45.Rh1 c3 46.Rh6 c2 47.Rc1 Ke7 48.Rh7+ Kd6 49.Rg7 Kc5 50.Rb7 Kc6 51.Rb8 Kc5 52.Rh1

2. (0.58): 38.Rc3 Kf7 39.Rf1 Rc7 40.Rc5 Ra7 41.h4 Ra6 42.Rc3 Rb6 43.Rb1 Ke6 44.Kf1 Kd6 45.Rcc1 Rb8 46.Ke2 Rg8 47.g5 Na2 48.Rc2 Nb4 49.Rd2 c5 50.h5 gxh5

3. (0.52): 38.Kg2 Kf6 39.Rf1 Ra6 40.Rc3 Rb6 41.f5 Ke7 42.f6+ Kf7 43.Rc5 Ra6 44.Rcc1 Rb6 45.g5 Nd3 46.Rb1 Rb4 47.Rxb4 axb4 48.a5 Nc5 49.Rb1 b3 50.a6 Nxa6 51.Rxb3 Nc5

4. (0.52): 38.Rf1 Ra6 39.Rc3 Na2 40.Rb3 Nb4 41.Rc1 Kf6 42.Kf1 Ra8 43.h4 Ke6 44.Ke2 Rc8 45.Rc5 Ra8 46.Rb1 Kd6 47.Rcc1 Na2 48.Rc2 Nb4 49.Rcb2 Rf8 50.Rc1 c5

5. (0.43): 38.h3 Kf6 39.Rc3 Ke7 40.Rf1 Ra6 41.f5 Nd3 42.Rb3 Nb4 43.g5 c5 44.f6+ Kf7 45.Rc1 Rc6 46.Rcc3 Rc7 47.Rb1 Na2 48.Rcb3 Nb4 49.Kf1 c4 50.Rc3 Nd3 51.Ke2

6. (0.42): 38.Rdc1 Ra6 39.Rb1 Kf6 40.Rcc1 Ke6 41.Kf1 Kd6 42.Ke2 Ra7 43.h4 c5 44.Kd2 Rf7 45.Rf1 Ke6 46.Rfe1 d4 47.exd4 Rxf4 48.dxc5 Rxg4 49.Rf1 Rxh4 50.Rf8 Rh3

7. (0.42): 38.Kf1 Kf7 39.Ke2 Ke6 40.Rcc1 Kd6 41.Rf1 Nd3 42.Ra1 Rf7 43.Rab1 Nb4 44.h4 c5 45.Kd2 d4 46.f5 gxf5 47.Rxf5 Rxf5 48.gxf5 Ke5 49.Rc1 Nd3 50.exd4+ cxd4 51.Rc4 Kxf5 52.Rxd4 Kf4

8. (0.42): 38.Kf2 Kf7 39.Ke2 Ke6 40.Rcc1 Kd6 41.Rf1 Nd3 42.Ra1 Rf7 43.Rab1 Nb4 44.h4 c5 45.Kd2 d4 46.f5 gxf5 47.Rxf5 Rxf5 48.gxf5 Ke5 49.Rc1 Nd3 50.exd4+ cxd4 51.Rc4 Kxf5 52.Rxd4 Kf4

9. (0.41): 38.Rb1 Kf6 39.Rf1 Ra6 40.Rcc1 Rb6 41.Kg2 h5 42.g5+ Kf5 43.Kg3 Nd3 44.Rb1 Rb2 45.Rxb2 Nxb2 46.Rb1 Nc4 47.Kf2 Kg4 48.Ke2 c5 49.Rc1 h4 50.Rd1 Nb6 51.Rg1+ Kf5 52.Rd1

10. (0.38): 38.Ra1 Kf6 39.Rf1 Ra6 40.Rcc1 Rb6 41.Kg2 h5 42.g5+ Kf5 43.Kg3 Nd3 44.Rb1 Rb2 45.Rxb2 Nxb2 46.Rb1 Nc4 47.Kf2 Kg4 48.Ke2 c5 49.Rg1+ Kf5 50.Rc1 Ke6 51.Rb1 h4 52.h3

11. (0.19): 38.Rd2 Kf7 39.Kf1 Ke6 40.Ke2 Kd6 41.Rc1 Rb7 42.h4 Nd3 43.Rh1 Rb4 44.h5 Ke6 45.hxg6 hxg6 46.Rh6 Kf6 47.Rc2 Kg7 48.Rh1 c5 49.Ra2 Rb8 50.g5 Kf7 51.Rc2

12. (0.18): 38.g5 Kf7 39.h4 Ke6 40.Kg2 Kd6 41.Rcc1 Rb7 42.h5 c5 43.hxg6 hxg6 44.Rh1 Nd3 45.Rb1 Rxb1 46.Rxb1 d4 47.Rb6+ Kc7 48.Rxg6 dxe3 49.Rg7+ Kd6 50.Kf1 Nxf4 51.Ke1 c4 52.Rf7 Ke5

The World - Gert Jan Timmerman, Chessgames Challenge 2007

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Analysis by Fruit 2.3.1 (28-ply):

1. (0.63): 38.h4 Ra6 39.Rc3 Kf7 40.Kg2 Na2 41.Rb3 Nb4 42.Rc1 Ke6 43.Rbc3 Kd6 44.Rf1 c5 45.f5 c4 46.g5 gxf5 47.Rxf5 Ra7 48.Rf6+ Kc5 49.Rc1 Rb7 50.Rf8 Nd3 51.Rc8+ Kd6 52.Rf1 Kd7 53.Rff8 Rb2+

2. (0.57): 38.Rdc1 Kf7 39.f5 Ra6 40.fxg6+ hxg6 41.g5 Ke7 42.R5c3 Rb6 43.Rb1 Kd6 44.Rf1 Nd3 45.Rf6+ Kc7 46.Rxg6 d4 47.Rg7+ Kd6 48.Rc4 Rb1+ 49.Kg2 dxe3 50.Rxe4 e2 51.Rxe2 Nf4+ 52.Kf2 Nxe2 53.Kxe2 Rb2+

3. (0.52): 38.Rc3 Kf7 39.Rf1 Rc7 40.Rc5 Ra7 41.h4 Ra6 42.Rcc1 Rb6 43.Kg2 h5 44.Kg3 Ke6 45.Rc5 Kd6 46.Rc3 hxg4 47.Kxg4 Nd3 48.Kg5 Rb2 49.Rg1 Re2 50.Rg3 Rh2 51.Kxg6 Rxh4 52.f5 c5

4. (0.50): 38.Kf1 Kf7 39.Ke2 Ke6 40.Rcc1 Rc7 41.Rf1 c5 42.f5+ Ke7 43.g5 Na2 44.Rc2 Nb4 45.Rc3 c4 46.h4 Ke8 47.f6 Kf7 48.Rb1 Na2 49.Ra3 Nb4 50.Kd2 Rb7 51.Rc3 Rb6 52.Rcc1 Rb8

5. (0.46): 38.Kf2 Kf7 39.Ke2 Ke6 40.Rcc1 Rc7 41.Rf1 c5 42.f5+ Ke7 43.g5 Na2 44.Rc2 Nb4 45.Rc3 c4 46.h4 Rc8 47.f6+ Kf7 48.Rh1 Rb8 49.h5 gxh5 50.Rxh5 Kg6 51.Rh1 Nd3 52.Kd2 Ne5 53.Kc2 Kxg5

6. (0.44): 38.Rf1 Ra6 39.Rc3 Rb6 40.Rb1 Kf6 41.h4 Ke6 42.Kf1 Kd6 43.Rcc1 c5 44.Ke2 Rb8 45.Rh1 Rg8 46.Rhd1 Rg7 47.g5 c4 48.Rf1 c3 49.f5 c2 50.Rbc1 gxf5 51.Rxf5 Rc7 52.Kd2 Ke6 53.Rf6+ Ke5

7. (0.43): 38.Kg2 Kf6 39.Rf1 Ra6 40.Rcc1 Nd3 41.Rb1 Nb4 42.Rfc1 Ke7 43.Kg3 Kd6 44.h3 c5 45.f5 c4 46.f6 Ke6 47.g5 Kf7 48.Kh4 Rb6 49.Kg4 Rb8 50.Rc3 Rc8 51.Rb2 Rb8 52.Rc1

8. (0.42): 38.h3 Kf6 39.Rc3 Ke7 40.Rf1 Ra6 41.f5 Nd3 42.Rb3 Nb4 43.g5 c5 44.f6+ Kf7 45.Rc3 c4 46.Kg2 Ra8 47.Rb1 h6 48.h4 h5 49.Kf2 Rb8 50.Kg3 Rb6 51.Rb2 Rc6 52.Kg2 Rb6

9. (0.36): 38.Ra1 Kf6 39.Rf1 Ra6 40.Rc3 Rb6 41.f5 Nd3 42.fxg6+ Kxg6 43.Kg2 Rb2+ 44.Kg3 Nb4 45.Rf8 Ra2 46.Rc1 Re2 47.Rcf1 h6 48.R1f6+ Kg7 49.R8f7+ Kg8 50.Rd7 Rxe3+ 51.Kf2 Rh3 52.Kg2 Rb3 53.Rg6+ Kf8

10. (0.36): 38.Rb1 Kf6 39.Rf1 Ra6 40.Rc3 Rb6 41.f5 Nd3 42.fxg6+ Kxg6 43.Kg2 Rb2+ 44.Kg3 Nb4 45.Rf8 Ra2 46.Rc1 Re2 47.Rcf1 h6 48.R1f6+ Kg7 49.R8f7+ Kg8 50.Rd7 Rxe3+ 51.Kf2 Rh3 52.Kg2 Rb3 53.Rg6+ Kf8

11. (0.23): 38.Rd2 Kf7 39.Kf1 Ke6 40.h4 Kd6 41.Rc1 Rb7 42.Rb1 c5 43.h5 d4 44.exd4 c4 45.hxg6 hxg6 46.Rh2 Rf7 47.Ke2 Rxf4 48.Rh8 Nc6 49.Ke3 Rxg4 50.Rb6 Rg3+ 51.Kxe4 Kc7 52.Rb5 Rg4+ 53.Ke3 Rxd4

12. (0.17): 38.g5 Kf7 39.h4 Ke6 40.Kg2 Kd6 41.Rcc1 c5 42.h5 gxh5 43.Kg3 Nd3 44.Rb1 d4 45.exd4 c4 46.Rd2 Kd5 47.f5 Kxd4 48.Rc2 c3 49.f6 Rc7 50.Rb8 e3 51.Re8 Ne5 52.Rd8+ Rd7 53.Rxd7+ Nxd7

<Tabanus: <imag> That's a secret :) No it's

37.Rc5 Ra7 38.Kg2 Kf6 39.Rf1 Ra6 40.f5 Nd3 41.fxg6+ Kxg6 42.Rc3 c5 43.h4 h6 44.Rf8 c4 45.h5+ Kg7 46.Rd8 Nb4 47.Rd7+ Kg8 48.Rc7 Nd3 49.Ra3 Rf6 50.Ra1 Rf7 51.Rc8+ Rf8 52.Rxf8+ Kxf8 53.Kf1 Ke7 54.Ke2 Kf6 55.Rb1 4.19/30

Sliding further back now.>

How to run xboard with a UCI engine under Linux.

Step 1) Install a utility program called "polyglot" that translates between xboard and UCI. Polyglot is packaged for many distributions. Let me know if you have any trouble with this step.

Step 2) Create a sub-directory of your home directory called ".polyglot" (just a suggested name). In that sub-directory, create a config file to tell polyglot about each particular chess engine you will use. I've set this up for Toga and my file is called "toga.ini". The contents of that file look like this:

***
[PolyGlot]

EngineDir = /tmp
EngineCommand = /usr/local/bin/toga

Book = false
BookFile = /usr/share/games/fruit/book_small.bin ; same directory as INI file, use full path otherwise

[Engine]

Hash = 64

***

I recall that a few examples came with the polyglot distribution.

Now you are ready to run xboard. As part of the command line for invoking xboard you will you use the -fcp (first chess program) option. This option takes a single argument, so if you need to pass it a command line with several arguments you will need to enclose those in quotes so they get treated like one argument by the linux shell. So it might look like this: -fcp "/usr/games/polyglot /home/rinus/.polyglot/toga.ini"

What I usually do after that is load the saved position (FEN file created by xboard when you save position) and then ask xboard to go into "analysis mode".

Step 4) (optional) - if you want you set up a shell script to help remember the syntax and save typing if the last invocation is no longer in your shell history. So I have an executable script called /usr/games/ptoga that looks like this:

#!/bin/bash

/usr/games/polyglot /home/j/.polyglot/toga.ini

Then I can just call xboard with -fcp ptoga

In many lines without the knowledge of the Rook sac it's Black's objective to get his King to d6; it would be nice if GMT would do as such.

But we should get good positions if GMT doesn't act like this, i.e. makes moves like Ra6 or so.

I'm going to analyse!

7: The World - Gert Jan Timmerman, Chessgames Challenge 2007

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Analysis by Fruit 2.3.1 (29-ply):

1. (0.74): 39.Rc3 Kf6 40.Kg2 Na2 41.Rb3 Nb4 42.Rc1 Ke6 43.h5 gxh5 44.Rh1 hxg4 45.Rxh7 Kf6 46.Kg3 Kg6 47.Rd7 Kf5 48.Rc3 Nd3 49.Rf7+ Ke6 50.Rh7 Nb2 51.Kxg4 Nxa4 52.Rc1 Rb6 53.Ra7 c5 54.Rxa5

2. (0.65): 39.Rcc1 Kf6 40.Kg2 Na2 41.Rc5 Nb4 42.Rc3 Na2 43.Rb3 Nb4 44.Rc1 Ke6 45.h5 gxh5 46.Rh1 hxg4 47.Rxh7 Kf6 48.Rc3 Kg6 49.Rd7 Nd3 50.Kg3 Kf5 51.Rh7 Kg6 52.Rh2 c5 53.Kxg4 Rb6

3. (0.49): 39.Rdc1 Kf6 40.Kg2 Ke7 41.R5c3 Kd6 42.Rf1 c5 43.f5 c4 44.g5 gxf5 45.Rxf5 Ra7 46.Kg3 Nd3 47.Rc2 Rb7 48.h5 Rc7 49.Rf6+ Ke5 50.Rf8 c3 51.g6 hxg6 52.hxg6 Rg7 53.Rxc3 Rxg6+ 54.Kh3 Rg1

4. (0.39): 39.Rb1 Kf6 40.Kg2 Ke6 41.Rc3 Na2 42.Rc2 Nb4 43.Rcc1 Kd6 44.Kg3 c5 45.f5 c4 46.f6 Ke6 47.g5 Rc6 48.Rc3 Na2 49.Ra3 Nb4 50.h5 gxh5 51.Rc3 Kf7 52.Kh4 Rb6 53.Kxh5 Rb8

5. (0.26): 39.Kf1 Nd3 40.Rc2 Rb6 41.Ke2 Kf6 42.Rxd3 exd3+ 43.Kxd3 Ke6 44.Rc5 Ra6 45.Kd4 Kd6 46.h5 gxh5 47.gxh5 Ra8 48.h6 Ra6 49.e4 Rb6 50.e5+ Ke6 51.Kc3 Ra6 52.Kd3 Kf5 53.Kd2 Rb6 54.Rxa5 Rb4

6. (0.02): 39.Kf2 Nd3+ 40.Rxd3 exd3 41.Ke1 Kf6 42.Kd2 h5 43.gxh5 gxh5 44.Kxd3 Ke6 45.Kc3 Kd6 46.Kd4 Ra7 47.e4 Rb7 48.e5+ Kd7 49.Rxa5 Rb4+ 50.Ke3 Ke6 51.Ra8 Rb3+ 52.Kd2 Rb4 53.Re8+ Kd7 54.Rf8 Ke7

7. (0.00): 39.Rd2 Nd3 40.Rc3 Rb6 41.Rdc2 Rb1+ 42.Kh2 Nb4 43.Rc1 Rb2+ 44.Kg3 Re2 45.Rb1 Ra2 46.g5 Rxa4 47.h5 Ra2 48.hxg6 hxg6 49.Rbb3 Re2 50.Ra3 Nd3 51.Rxc6 Rxe3+ 52.Kh2 Re2+ 53.Kg3 Re3+

The World - Gert Jan Timmerman, Chessgames Challenge 2007

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Analysis by Fruit 2.3.1 (30-ply):

1. (0.73): 39.Rc3 Kf6 40.Kg2 Na2 41.Rb3 Nb4 42.Rc1 Ra8 43.Kg3 h5 44.Rbc3 Ra6 45.gxh5 gxh5 46.Kh2 Rb6 47.Rb1 Ke7 48.Rcc1 Kf7 49.Rb3 Rb8 50.Rc5 Ra8 51.Rb1 Ra6 52.Kg3 Kf6 53.Rc3 Nd3 54.Rc2 c5

2. (0.66): 39.Rcc1 Kf6 40.Kg2 Ke6 41.h5 Nd3 42.Rb1 gxh5 43.Rb7 Ra8 44.Rxh7 hxg4 45.Rh6+ Kd7 46.Rb1 Kc7 47.Kg3 Rf8 48.Rh7+ Kd6 49.Rbb7 Kc5 50.Rh2 Kd6 51.Rh1 d4 52.Rh6+ Kc5 53.Rh5+ Kd6 54.exd4 Nxf4

3. (0.45): 39.Rdc1 Kf6 40.Kg2 Ke7 41.R5c3 Kd6 42.Rf1 c5 43.f5 c4 44.g5 gxf5 45.Rxf5 Ra7 46.Kg3 Nd3 47.Rc2 Rb7 48.h5 Rc7 49.Rf6+ Ke5 50.Rf8 Ke6 51.Rc3 Rf7 52.Rxf7 Kxf7 53.Rc2 Nc5 54.Rf2+ Ke6

4. (0.41): 39.Rb1 Kf6 40.Kg2 Ke6 41.Rc3 Na2 42.Rc2 Nb4 43.Rcc1 Kd6 44.Rf1 c5 45.f5 Ke7 46.g5 c4 47.Rbc1 Nd3 48.f6+ Kf7 49.Rb1 Nb4 50.Rfc1 Ra7 51.Rc3 Na2 52.Ra3 Nb4 53.Kf2 Rb7 54.Ke2 Rb8

5. (0.15): 39.Kf1 Nd3 40.Rc2 Rb6 41.Ke2 Kf6 42.Rxd3 exd3+ 43.Kxd3 Ke6 44.Rc5 Ra6 45.Kd4 Kd6 46.h5 gxh5 47.gxh5 h6 48.f5 Ra7 49.f6 Rf7 50.e4 dxe4 51.Rf5 e3 52.Kxe3 Ke6 53.Rxa5 Rxf6 54.Rc5 Kd6

6. (0.06): 39.Kf2 Nd3+ 40.Rxd3 exd3 41.Ke1 Kf6 42.Kd2 h5 43.gxh5 gxh5 44.Kxd3 Ke6 45.Kc3 Kd6 46.Kd4 Ra7 47.e4 Rb7 48.e5+ Kd7 49.Rxa5 Rb4+ 50.Ke3 Ke6 51.Ra8 Rb3+ 52.Ke2 Rb4 53.Kf3 Rb3+ 54.Kg2 Rb4

7. (0.00): 39.Rd2 Nd3 40.Rc3 Rb6 41.Rdc2 Rb1+ 42.Kh2 Nb4 43.Rc1 Rb2+ 44.Kg3 Re2 45.Rb1 Ra2 46.g5 Rxa4 47.h5 Ra2 48.Rh1 Re2 49.Kh4 gxh5 50.Kxh5 Nc2 51.Rxc6 Nxe3 52.Rh3 a4 53.Rc7+ Kg8 54.Ra7 Ng2

The World - Gert Jan Timmerman, Chessgames Challenge 2007

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Analysis by Fruit 2.3.1 (25-ply):

1. (0.72): 40.Kg2 Rb6 41.Kg3 h5 42.gxh5 gxh5 43.Rg1 Nd3 44.Rb1 Nb2 45.Rgc1 Ke7 46.f5 Kf7 47.Rc2 Nxa4 48.Rxb6 Nxb6 49.Rxc6 Nc4 50.Kf4 a4 51.Rc7+ Kf6 52.Rh7 a3 53.Ra7 d4 54.Ra6+ Kf7 55.exd4

2. (0.72): 40.Kh2 Rb6 41.Kg3 h5 42.gxh5 gxh5 43.Rg1 Nd3 44.Rb1 Nb2 45.Rgc1 Ke7 46.f5 Kf7 47.Rc2 Nxa4 48.Rxb6 Nxb6 49.Rxc6 Nc4 50.Kf4 a4 51.Rc7+ Kf6 52.Rd7 a3 53.Ra7 d4 54.Ra6+ Kf7 55.exd4

3. (0.56): 40.g5 Ke6 41.h5 gxh5 42.Kh2 Nd3 43.Rb1 Nf2 44.Re1 Ng4+ 45.Kg3 Kf5 46.Rb7 h6 47.gxh6 Nxh6 48.Kh4 Ng4 49.Rg7 Rb6 50.Kxh5 Nf6+ 51.Kh4 c5 52.Rc7 c4 53.Rg1 Rb3 54.Rg5+ Ke6

4. (0.51): 40.Rf1 Rb6 41.Kg2 Ke6 42.Rb1 c5 43.f5+ Ke5 44.fxg6 Rxg6 45.Kg3 h6 46.Rf5+ Ke6 47.Rf2 Rf6 48.Rxf6+ Kxf6 49.Rf1+ Kg7 50.Kf2 h5 51.gxh5 Kh6 52.Kg3 Kxh5 53.Rf5+ Kg6 54.Kg4 c4 55.h5+ Kg7

5. (0.50): 40.Kf1 Ke6 41.Ke2 Na2 42.Rc2 Nb4 43.Rc3 Rb6 44.Rb1 Kd6 45.Rcc1 c5 46.Kd2 Rc6 47.h5 gxh5 48.gxh5 d4 49.h6 Nd5 50.exd4 cxd4 51.Rxc6+ Kxc6 52.f5 Kd6 53.Rb7 Ke5 54.Rxh7 e3+ 55.Kd3 Nf4+

6. (0.50): 40.h5 gxh5 41.gxh5 Ke6 42.Kh2 Rb6 43.Rg1 Nd3 44.Rc2 Kf6 45.h6 Rb2 46.Rcg2 Kf5 47.Kh3 Rb3 48.Kh4 d4 49.Rg5+ Kf6 50.exd4 e3 51.Rg8 e2 52.Re8 e1Q+ 53.Rexe1 Nxe1 54.Rxe1 Rb4 55.Rc1 Rxd4

7. (0.38): 40.Rd2 Nd3 41.Rb1 Nb4 42.Rh2 c5 43.h5 d4 44.Kf2 Rf6 45.hxg6+ hxg6 46.g5 Rb6 47.Ke2 d3+ 48.Kd1 Nd5 49.Rh7+ Ke6 50.Rxb6+ Nxb6 51.Rg7 Nd5 52.Kd2 c4 53.Rxg6+ Kd7 54.Kc1 Nxe3 55.Ra6 Nd5

8. (0.29): 40.f5 Nd3 41.Rb1 Ne5 42.Rb7+ Kf6 43.fxg6 Kxg6 44.Kf1 Nxg4 45.Ke2 Kf5 46.h5 Nf6 47.h6 c5 48.Rh1 Ke6 49.Rg1 d4 50.Kd2 Rd6 51.Rgg7 Rd8 52.Ra7 Nd5 53.exd4 cxd4 54.Rxa5

9. (0.26): 40.Rc3 Ke6 41.h5 Rb6 42.Rb1 Kd6 43.Kf1 c5 44.hxg6 hxg6 45.Rc2 c4 46.Rh2 Rc6 47.Rh6 Ke7 48.Ke2 c3 49.Rh7+ Kf6 50.g5+ Ke6 51.Rg7 c2 52.Rc1 Kf5 53.Rf7+ Ke6 54.Rf6+ Kd7 55.Rxc6 Kxc6

10. (0.00): 40.Kf2 Nd3+ 41.Rxd3 exd3 42.Ke1 Ke6 43.Kd2 Kd6 44.Rb1 Ra7 45.Kxd3 Re7 46.h5 Re4 47.Rb7 gxh5 48.gxh5 Rxa4 49.Rxh7 Ra3+ 50.Ke2 Ra2+ 51.Kd3 Ra3+