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Thus played Vitruvius

And you, how would you play?

















Human aspirations

Human Test

1 12-03-2012 in Style of Play by Domenico Lattanzi
Introduction

The aim of this test was to compare in a systematic way the ability of various Chess Engines to suggest or play human-type moves (positional sacrifices being our main concern here). The test ‘jig’ we applied involved the following procedure which was carried out for each engine:

  • To every engine I presented the same 25 test positions, chosen from games in which a typical ‘human’ positional sacrifice was played.
  • The test consisted in having each engine ‘solve’ the position in question. If after 30 seconds the engine gives as its best move the move actually played in the game then the position was considered solved by that engine.
  • What was paramount to our test was that the engine after hitting on the right move kept it as its first option up to the passing of the 30th second.
  • The test would be considered negative if the engine after choosing the target move and kept as its top option for any duration of time then substituted it with some other alternative at the passing of the 30th second of analysis.
  • To test the true style of play of the engines in the group access to opening books was negated.
  • Allowance was made for possible solutions arrived at by transpositions as in the case shown in the following diagram.

Aronian Levon-Carlsen Magnus
Nice 2010

The move we are after here is 20… Cexd5, but the following variations are equivalent and are therefore considered both valid:

  • 20… Cfxd5 21. cxd5 Cxd5 22. Rh3 Cf4+
  • 20… Cexd5 21. cxd5 Cxd5 22. Rh3 Cf4+








Results

Following are the results registered for the various engines:
performance = number of solved positions / total number of positions (25)



The test confirmed our belief in Vitruvius’ ability to perform close to human standards. This is emphatically so for the Human version, but even the Conservative version’s performance is way and above that of the other engines. Only Zappa Mexico (dissident aggressor configuration) is in some ways comparable to Vitruvius.

Test Positions
















FEN: 2rqkb1r/1b1n1ppp/pn1pp3/1p6/3NP1P1/2NBBP2/PPP2Q1P/1K1R3R
SOLUTION: 1… Txc3
















FEN: r4rk1/2q1bppp/p1b2n2/1p2p3/1P2P3/P1NBB3/2P1QRPP/5RK1
SOLUTION: 1. Txf6
















FEN: r1bqr1k1/pp3pbp/2n2np1/2Pp4/3N4/2N1BP2/PP1QB1PP/R4RK1
SOLUTION: 1… Txe3
















FEN: b2r3r/k4p1p/p2q1np1/NppP4/3p1Q2/P4PPB/1PP4P/1K1RR3
SOLUTION: 1. Txd4
















FEN: 1q6/2Rb3k/4rpp1/1p2p2p/pP1rP2P/P3QPP1/2R4K/5B2
SOLUTION: 1. Dxd4
















FEN: 1r3rk1/p4ppp/b1p1p3/2qn4/2P5/1Q4P1/P2BPPBP/R2R2K1
SOLUTION: 1. cxd5
















FEN: r4bk1/p1B2pp1/1pp3p1/2P1R1P1/2nP2B1/P6P/5P2/6K1
SOLUTION: 1. d5
















FEN: r2q1nk1/3b1rb1/N2p4/3Pp1pp/p3Pp2/5P2/1P2BBPP/2RQ1R1K
SOLUTION: 1. Tc6
















FEN: 2r1kb1r/1b1n1ppp/pq1ppn2/1p4B1/4PP2/1NNB3Q/PPP3PP/2KRR3
SOLUTION: 1… Txc3
















FEN: 2r2rk1/2pR1p1b/1pq1pQp1/p3P2p/P1PR3P/1P3P2/6PK/8
SOLUTION: 1. Rg3
















FEN: r2q1rk1/p2pbppp/1pn5/2p2N2/1n6/6P1/PP1QPPBP/R1B1K2R b KQ
SOLUTION: 1… Cd4
















FEN: 4r1k1/pp2pp1p/3p2p1/2qb1PPn/3N4/2P1R3/P1P2Q1R/2K5
SOLUTION: 1. Txh5
















FEN: r1r3k1/1b2qnpp/p2b1p2/Pp1p4/3P1P1P/1Q2P1P1/1B1NBK2/R2R4
SOLUTION: 1… Tc4
















FEN: 8/p3q1kp/1p2Pnp1/3pQ3/2pP4/1nP3N1/1B4PP/6K1
SOLUTION: 1. Aa3
















FEN: r1b4r/1p2kppp/3Npn2/2q1p3/8/2N4P/PPP3P1/R2Q1R1K
SOLUTION: 1. Txf6
















FEN: 3r2k1/1r1qpp1p/2R3p1/1p1P4/nP1Q3P/6P1/5PB1/4R1K1
SOLUTION: 1. h5
















FEN: r3r1k1/ppqnbppp/2p2n2/5N2/2P5/2B1PN2/PPQ3PP/2KR3R
SOLUTION: 1. Cxg7
















FEN: r2q1rk1/1b3ppp/p4n2/3P4/1bpQ4/5N1P/P1B2PP1/R1B1R1K1
SOLUTION: 1. Tb1
















FEN: 1rq1kbn1/3b1ppr/p2p3p/2nPp2N/4P2B/N4Q2/2R1BPPP/2R3K1
SOLUTION: 1. Txc5
















FEN: rq3rk1/p2p2pp/1pb1p3/4b2Q/2P1PB2/P2B2P1/1P5P/2KR1R2
SOLUTION: 1… Txf4
















FEN: r4b1k/3b2r1/pq1p1n1n/3Pp1pp/1P2Pp2/N1R2P1P/1Q1BBNP1/2R3K1
SOLUTION: 1. Tc6
















FEN: 3rq1k1/4rppp/2n3b1/pp2P3/2pP1QB1/P1P1R3/1B4PP/4R1K1
SOLUTION: 1… Te6
















FEN: r3qrk1/1pp4p/5p1P/p1p1p3/P3Pn2/1P1P4/1BP4Q/R4RK1
SOLUTION: 1. Txf4
















FEN: 4r1k1/1p1qppbp/p2p1np1/P2P1b2/Rnr5/1NN3P1/1PPQ1PBP/2B1R1K1
SOLUTION: 1… Txc3
















FEN: r2q1r1k/1b2n1bp/3p1np1/p2Pp3/NpP3P1/1P6/P2BBNKP/2RQ1R2
SOLUTION: 1… Cexd5




Last Modified: Saturday 17 March, 2012
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