Analyzing games with Let's Check

by ChessBase
12/9/2011 – After demonstrating how Let's Check users contribute to the LiveBook for all the moves of a top game being broadcast, this brings to light another aspect of the Let's Check function: its use for game analysis. Let's Check can not only be used to provide comprehensive analysis of recent games, but you can even request others to analyze your games.

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Analyzing games with Let's Check

After demonstrating how Let's Check users contribute to the LiveBook for all the moves of a top game being broadcast, this brings to light another aspect of the Let's Check function: its use for game analysis.

Let's Check can not only be used to provide comprehensive analysis of recent games, but even of your own games by request.

Retrieving LiveBook analysis

Those following the broadcasts of the London Chess Classic with Let's Check running, know that many users have powerful systems displaying top-engine analysis at great depth that others can see. These analyses can surpass our own, and just as importantly, provide evaluations and variations of up to three different engines. All these analyses are stored in the LiveBook for later perusal, and can then be added to the game notation at any time.

Bear in mind, you can request LiveBook analyses your own game to retrieve evaluations of positions that have already been seen. You never know when you will discover that an opening or middlegame you played hasn't already been seen and contributed from another source.


The first thing to do is to have the game you want analyzed visible in the notation


Next connect to Let's Check through the Engine tab at the top


Switch to the Analysis tab and click on "Let's Check Analysis"


A pane will open with several options. Standard Analysis is the option you want. Leave
User Names checked to see the users who contributed the lines, and Include Text
Comments, if any were added. (Note: you can contribute your own as well)


The end result will look as above, with up to three variations for every move, including
the evaluations, depth, and the engine signing them.


Here is a sample of the Let's Check analysis done for Carlsen-Nakamura:

NB: The javascript replayer does not display the evaluation and depth, however below it is a link to download the PGN, to visualize in the program of your choice.

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MoveNResultEloPlayers
Replay and check the LiveBook here
Engine/Game Correlation: White = 84%, Black = 46%. 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d3 Bc5 5.c3 d6 6.Bb3 a6 7.Nbd2 Ba7 8.Nf1 h6 9.Ng3 0-0 10.0-0 Be6 11.h3 Qd7 11...d5 12.exd5 Nxd5 Houdini 1.5 x64/Timpov 11...d5 12.exd5 Bxd5 Houdini 2.0 x64/Newton Ville 11...d5 12.exd5 Nxd5 Deep Shredder 12 x64/ Myrddin 12.Be3 12.Be3 Bxe3 13.fxe3 Houdini 1. 5 x64/Timpov 12.Be3 Bxe3 13.fxe3 Houdini 2.0 x64/Newton Ville 12.Bxe6 Qxe6 13.d4 Fritz 13 12...Ne7 12...Bxe3 13.fxe3 Bxb3 Deep Rybka 4.1 x64/Christofer 12...Bxe3 13.fxe3 Bxb3 Houdini 2.0 x64/hemmer 12...Bxb3 13.axb3 Bxe3 Stockfish 2.1.1/Tirnamog 13.Nh4 13.d4 Bxb3 14.Qxb3 Houdini 2.0 x64/hemmer 13.d4 exd4 14.cxd4 Deep Rybka 4.1 x64/Christofer 13.Bxa7 Rxa7 14.d4 Crafty 20.14 w32/Phenomenonly 13...Ng6 13...Bxb3 14.Qxb3 a5 Houdini 2.0 x64/hemmer 13...Bxe3 14.fxe3 Nh7 Stockfish 2.1.1/ashtaroon 13...a5 14.Bxe6 fxe6 Houdini 2.0 x64/Newton Ville 14.Nhf5 14.Nxg6 fxg6 15.d4 Fritz 13/marst 14.Nxg6 fxg6 15.d4 Houdini 2.0 x64/Newton Ville 14.Nxg6 fxg6 15.d4 Deep Rybka 4.1 x64/Christofer 14...Ne7 14...Bxe3 15.fxe3 Qd8 Deep Rybka 4.1 x64/Timpov 14...d5 15.Qf3 dxe4 Deep Rybka 4.1 x64/Timpov 14...Ne7 15.Nxe7+ Qxe7 Houdini 2.0 x64/Newton Ville 15.Nxe7+ 15.Bxe6 fxe6 16.Nxe7+ Fritz 13/marst 15.Bxa7 Houdini 2.0 x64/hemmer 15.Nxe7+ Qxe7 16.Bxe6 Houdini 2.0 x64/Newton Ville 15...Qxe7 15...Qxe7 16.Bxe6 fxe6 Houdini 2.0 x64/Newton Ville 15...Qxe7 16.Bxa7 Rxa7 Stockfish 2.1.1/ashtaroon 15...Qxe7 16.Bxa7 Rxa7 Fritz 13 16.Bxa7 16.Bxe6 fxe6 17.Bxa7 Houdini 2.0 x64/Newton Ville 16.Bxa7 Rxa7 Deep Rybka 4.1 x64/Christofer 16.Bxe6 fxe6 17.Bxa7 Houdini 2.0 x64/hemmer 16...Rxa7 16...Rxa7 17.f4 Raa8 Houdini 2.0 x64/Newton Ville 16...Bxb3 17.Qxb3 Rxa7 Crafty 20.14 w32/Phenomenonly 16...Rxa7 17.Bxe6 Qxe6 Komodo 32/Hob 17.f4 17.Bxe6 fxe6 18.d4 Fritz 13 17.f4 Raa8 18.Bxe6 Houdini 2.0 x64/ Newton Ville 17.Nf5 Bxf5 18.exf5 Crafty 20.14 w32/ Phenomenonly 17...c5 17...Raa8 18.Bxe6 fxe6 Houdini 2.0 x64/Newton Ville 17...Raa8 18.Bxe6 Qxe6 Crafty 20.14 w32/Phenomenonly 17...Raa8 18.Bxe6 fxe6 Deep Rybka 4. 1 x64/Christofer 18.Bc2 18.Qf3 b6 19.Rf2 Crafty 20.14 w32/Phenomenonly 18.Bxe6 fxe6 19.f5 Houdini 2. 0 x64/hemmer 18.Bxe6 fxe6 19.fxe5 Deep Rybka 4.1 x64/ Christofer 18...b5 18...b5 19.Qd2 Rd8 Houdini 2.0 w32/safary 18...exf4 19.Rxf4 b5 Crafty 20.14 w32/Phenomenonly 18...Raa8 19.f5 Houdini 2.0 x64/Newton Ville 19.Qd2 19.Qd2 Rc7 20.Rf2 Houdini 2.0 x64/Newton Ville 19.Qf3 Re8 20.Rae1 Crafty 20.14 w32/ Phenomenonly 19.Qd2 Rb7 20.Rf2 Stockfish 2.1.1/ashtaroon 19...Rb7 19...Rc7 20.Rf2 Bc8 Houdini 2.0 x64 19...Rc7 20.Rf3 Rc6 Deep Rybka 4.1 x64/Christofer 19...Rb7 20.Rf2 exf4 Stockfish 2.1.1/ashtaroon 20.a3 20.Rf2 Bd7 21.Raf1 Deep Rybka 4.1 x64/Timpov 20.Rf3 exf4 21.Rxf4 Houdini 2.0 x64/Newton Ville 20.Rf3 Houdini 2.0 x64/Newton Ville 20...a5 20...Rfb8 21.Rf2 Houdini 2.0 x64 20...a5 21.Rf3 b4 Houdini 1.5 x64/LondonFlip 20...Rd8 21.Rf2 Nh7 Stockfish 2.1.1/ ashtaroon 21.Rf2 21.Rf2 b4 22.axb4 Houdini 2. 0 x64/Newton Ville 21.Rf2 b4 22.axb4 Houdini 1.5 w32/ Gumption 21.Rf3 b4 22.axb4 Houdini 2.0 x64/Newton Ville 21...b4 21...exf4 22.Qxf4 b4 Houdini 2.0 x64 21...exf4 22.Rxf4 b4 Deep Rybka 4.1 x64/Christofer 21...b4 22.axb4 axb4 Stockfish 2.1.1/ashtaroon 22.axb4 22.axb4 axb4 23.Raf1 Houdini 2.0 x64/Newton Ville 22.Raf1 bxc3 23.bxc3 Houdini 1.5 x64/mely 22.axb4 axb4 23.Raf1 Stockfish 2.1.1/ashtaroon 22...axb4 22...axb4 23.Raf1 exf4 Houdini 2.0 x64/Newton Ville 22...axb4 23.Raf1 bxc3 Stockfish 2.1.1/ashtaroon 22...exf4 23.Rxf4 axb4 Houdini 2.0 x64 23.Raf1 23.Raf1 exf4 24.Rxf4 Houdini 2.0 x64/Newton Ville 23.d4 bxc3 24.bxc3 Houdini 1.5 x64/mely 23.c4 Rd8 24.Rff1 Houdini 2.0 x64/ Menno7 23...bxc3 23...exf4 24.Rxf4 bxc3 Houdini 2.0 x64/Newton Ville 23...exf4 24.Rxf4 bxc3 Stockfish 2.1.1/biniek 23...bxc3 24.bxc3 exf4 Stockfish 2. 1.1/ashtaroon 24.bxc3 24.bxc3 exf4 25.Rxf4 Houdini 2.0 x64/Newton Ville 24.bxc3 exf4 25.Rxf4 Houdini 1. 5 x64/AsynchronA 24.bxc3 exf4 25.Rxf4 Stockfish 2.1.1/ ashtaroon 24...exf4 24...exf4 25.Rxf4 Nh7 Houdini 2.0 x64/Newton Ville 24...exf4 25.Rxf4 Nd7 Deep Fritz 12/oops 24...exf4 25.Rxf4 Nd7 Fritz 13 25.Rxf4 25.Rxf4 Nh7 26.d4 Houdini 2.0 x64/Newton Ville 25.Rxf4 Nh7 26.d4 Deep Rybka 4.1 x64/Christofer 25.Rxf4 Nh7 26.Nf5 Stockfish 2.1.1/ashtaroon 25...Nh7 25...Nh7 26.d4 Qg5 Houdini 2.0 x64/Newton Ville 25...Nh7 26.d4 cxd4 Houdini 1.5 x64/mely 25...Nd7 26.Nf5 Bxf5 Houdini 2.0 x64/Menno7 26.d4 26.Nf5 Qc7 27.R4f2 Houdini 2.0 x64/hemmer 26.Nf5 Bxf5 27.Rxf5 Deep Rybka 4.1 x64/Christofer 26.d4 Qg5 27.Qd3 Houdini 2.0 x64/Newton Ville 26...cxd4 26...Qg5 27.Qd3 cxd4 Houdini 2.0 x64/Newton Ville 26...cxd4 27.cxd4 Rc8 Deep Rybka 4.1 x64/Christofer 26...Qg5 27.Kh2 cxd4 Stockfish 2.1.1/ashtaroon 27.cxd4 27.cxd4 Qg5 28.Kh2 Houdini 2.0 x64/Newton Ville 27.cxd4 Rb2 28.Qc1 Deep Fritz 12/oops 27.cxd4 Rb2 28.Qc1 Stockfish 2.1.1/ ashtaroon 27...Qg5 27...Qg5 28.Kh2 Rb2 Houdini 2.0 x64/Newton Ville 27...Rb2 28.Qc1 Rb4 Houdini 1. 5 x64 27...Qg5 28.Qd3 Qb5 Stockfish 2.1.1/ashtaroon 28.Kh2 28.Qd3 Rb2 29.h4 Houdini 2.0 x64/Newton Ville 28.Qd3 Rb2 29.h4 Deep Rybka 4.1 x64/Christofer 28.Kh2 Rb2 29.h4 Houdini 2.0 x64/hemmer 28...Nf6 28...Rc8 29.Bd1 Rcc7 Houdini 2.0 x64/Menno7 28...Nf6 29.Bd1 Ra8 Stockfish 2.1.1/ashtaroon 28...Rc8 29.h4 Qe7 Fritz 13 29.Bd1 29.Bd1 h5 30.h4 Houdini 2.0 x64/hemmer 29.d5 Bd7 30.Qd4 Deep Rybka 4. 1 x64/Christofer 29.Bd1 Ra8 30.h4 Stockfish 2.1.1/ashtaroon 29...Rfb8 29...h5 30.h4 Qh6 Houdini 1.5 x64/biniek 29...h5 30.h4 Qh6 Houdini 2.0 x64/hemmer 29...Ra8 30.h4 Qa5 Fritz 13/DarthVader 30.h4 30.h4 Qg6 31.Rxf6 Houdini 2.0 x64/Newton Ville 30.Qc3 Rc8 31.Qa3 Stockfish 2.1.1/ashtaroon 30.Qc3 Ra7 31.h4 Fritz 13 30...Qg6 30...Qg6 31.Rxf6 gxf6 Houdini 2.0 x64/Newton Ville 30...Qg6 31.Rxf6 gxf6 Fritz 13/chmg 30...Qg6 31.Rxf6 gxf6 Stockfish 2.1.1/ ashtaroon 31.Rxf6 31.Rxf6 gxf6 Houdini 2.0 x64/Newton Ville 31.Rxf6 gxf6 32.d5 Deep Rybka 4.1 x64/ Christofer 31.d5 Bd7 32.Qc3 Deep Shredder 12 31...gxf6 31...gxf6 Houdini 2.0 x64/Newton Ville 31...gxf6 32.Qf4 Kh7 Fritz 13 31...gxf6 32.Qf4 Rb6 Stockfish 2.1.1/ashtaroon 32.Qf4 32.Qf4 Rb1 33.d5 Houdini 2.0 x64/Newton Ville 32.d5 Rb2 33.Qf4 Deep Rybka 4.1 x64/Christofer 32.Qf4 Rb6 33.Rf2 Stockfish 2.1.1/ashtaroon 32...Rb2 32...Rb1 33.d5 Bc8 Houdini 2.0 x64/Newton Ville 32...Kh8 33.Bh5 Deep Rybka 4. 1 x64/Christofer 32...Rb6 33.Rf2 Kh8 Stockfish 2.1.1/ ashtaroon 33.Bh5 33.Bh5 Qg7 34.Bf3 Houdini 2.0 x64/hemmer 33.d5 Bc8 34.Bh5 Deep Rybka 4.1 x64/ Christofer 33.Bh5 Qg7 34.d5 Stockfish 2.1.1/ashtaroon 33...Qg7 33...Qg7 34.Bf3 Qg6 Houdini 2.0 x64/ Newton Ville 33...Qg7 34.d5 Bxd5 Houdini 1.5 x64/mely 33...Qg7 34.d5 Bc8 Fritz 13/DarthVader 34.Bf3 34.Bf3 Qg6 35.d5 Houdini 2.0 x64/Newton Ville 34.d5 Bxd5 35.exd5 Deep Rybka 4.1 x64/Christofer 34.Bf3 Qg6 35.d5 Houdini 2.0 x64/hemmer 34...Ra8? 34...Qg6 35.d5 Bc8 Houdini 2.0 x64/Newton Ville 34...Qg6 35.d5 Bc8 Fritz 13/Ulrich Reimer 34...Rd8 35.Ra1 Rc2 Deep Rybka 4 x64/mely 35.d5+- 35.d5 Bc8 36.Nh5 Houdini 2.0 x64/Newton Ville 35.Nh5 Qg6 36.d5 Deep Rybka 4.1 x64/Christofer 35.d5 Bc8 36.Nh5 Stockfish 2.1.1/ashtaroon 35...Bc8 35...Kh8 36.dxe6 fxe6 Houdini 2.0 x64/Newton Ville 35...Bc8 36.Nh5 Qg6 Deep Shredder 12 x64/Myrddin 35...Bc8 36.Nh5 Qg6 Stockfish 2.1.1/ashtaroon 36.Nh5 36.Nh5 Houdini 2.0 x64/Newton Ville 36.Nh5 Qg6 37.Qxd6 Stockfish 2.1.1/ashtaroon 36.Nh5 Qg6 37.Nxf6+ Deep Shredder 12 x64/ Myrddin 36...Qf8? 36...Qg6 37.Qxd6 Rxg2+ Houdini 2.0 x64/Newton Ville 36...Qg6 37.Nxf6+ Kg7 Deep Shredder 12 x64/Myrddin 36...Qg6 37.Nxf6+ Kg7 Deep Rybka 4 x64/candle_power 37.Nxf6+ 37.Rc1 Houdini 2.0 x64/Newton Ville 37.Nxf6+ Kh8 38.Rc1 Stockfish 2.1.1/ashtaroon 37.Nxf6+ Houdini 1.5 x64/ LondonFlip 37...Kh8 37...Kh8 38.Rc1 Houdini 2.0 x64/Newton Ville 37...Kh8 Deep Shredder 12 x64/ Myrddin 37...Kh8 38.e5 Houdini 2.0 x64/ChessKitteh 38.Rc1 38.Rc1 Houdini 2.0 x64/Newton Ville 38.Rc1 Rba2 Deep Shredder 12 x64/Myrddin 38.Rc1 Rba2 39.e5 Stockfish 2.1.1/ashtaroon 38...Kg7? 38...Rba2 39.e5 dxe5 Houdini 2.0 x64/Newton Ville 38...Rba2 Deep Shredder 12 x64/Myrddin 38...Rba2 39.e5 dxe5 Stockfish 2.1.1/ashtaroon 39.e5+- 39.e5 Houdini 2.0 x64/Newton Ville 39.e5 Rbb8 40.exd6 Stockfish 2.1.1/ashtaroon 39.e5 Rbb8 40.Rc6 Fritz 13 39...dxe5 39...Bd7 40.Nxd7 Houdini 2.0 x64/hemmer 39...Bd7 40.Nxd7 Qe7 Houdini 2.0 x64/Newton Ville 39...Rbb8 40.exd6 Bf5 Stockfish 2.1.1/ ashtaroon 40.Nh5+ 40.Nh5+ Houdini 2.0 x64/Newton Ville 40.Qxe5 Rb4 41.Nd7+ Houdini 2.0 w32 40.Nh5+ Kg8 41.Qg3+ Fritz 13 40...Kh7 40...Kg8 41.Qg3+ Houdini 2.0 x64/Newton Ville 40...Kh8 41.Qxe5+ f6 Fritz 13 40...Kg8 41.Qg3+ Kh8 Stockfish 2.1.1/ashtaroon 41.Be4+ 41.Be4+ Kg8 42.Qg3+ Kh8 Fritz 13 41.Be4+ Kh8 42.Qxe5+ f6 Deep Rybka 4 x64/candle_power 41.Be4+ Kg8 42.Qg3+ Kh8 Stockfish 2.1.1/ashtaroon 1–0
  • Start an analysis engine:
  • Try maximizing the board:
  • Use the four cursor keys to replay the game. Make moves to analyse yourself.
  • Press Ctrl-B to rotate the board.
  • Drag the split bars between window panes.
  • Download&Clip PGN/GIF/FEN/QR Codes. Share the game.
  • Games viewed here will automatically be stored in your cloud clipboard (if you are logged in). Use the cloud clipboard also in ChessBase.
  • Create an account to access the games cloud.
WhiteEloWBlackEloBResYearECOEventRnd
Carlsen,M2826Nakamura,H27581–02011C503rd Chess Classic3

Analyzing your own games

Another option is to enlist the help of others to analyze your games. Though Fritz can obviously analyze them from your own computer with the engine of your choice, this process does allow deeper analysis in a shorter period of time. The reason is that the server does not simply ask one move at a time, but rather sends off each position to a different user, and thus has numerous users split up the work of analyzing your game.

There is a cost, and it is not a monetary one. Each position you analyze and contribute to the LiveBook gives you credits, and each position for which you request analysis costs you credits. Thus, no one is able to simply take without giving.

The process for requesting game analysis is very simple and surprisingly fast depending on the number of users connected.


First make sure your game is visible in the Notation


Next, go to the Analysis pane and click on Submit Game. Within minutes you will see
variations and evaluations begin to populate the game score. Don't forget to save it!

Happy analysis!


Fritz 13 and Let's Check – Lesson one: getting started
31.10.2011 – You have ordered Fritz 13, on DVD or as a download in the ChessBase Shop. And you have heard a lot about the new Let's Check function. How do you get started? In our tutorial series we begin with some very basic instructions on how to activate the program and then take a few initial steps into the world of cloud computing. Too daunting? Take a look – 
it's easier than you think.
Hoogeveen: Kramnik beats Polgar, leads by a full point
20.10.2011 – In round two Vladimir Kramnik beat Judit Polgar – as usual, we are tempted to say. In twenty classical encounters Judit still has to win a single one. At the end of this game Fritz 13 surprised people on Playchess by announcing mate in 45 moves – on a super-fast spectator machine. In rounds three and four all games were drawn, but some of them quite interesting. 
Report and commentary.
Fritz 13 is now available – let's check who needs it!
13.10.2011 – “Success very often is the enemy of future success," Garry Kasparov warned us some months ago. Changing the world once is not enough, he said, we needed to do it again. Well, we are trying. Today we launch Fritz 13, which incorporates a tantalizing new feature: "Let's Check", which provides communal analysis in the cloud. You can order it now or download it for 
instant access.

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