Cumulus

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[ Cumulonimbus and Cumulus clouds [1] Cumulus,

the second chess program by Jean-Christophe Weill and Marc-François Baudot, written in C with a few 8086 Assembly snippets [2]. Cumulus played the WMCCC 1990, WMCCC 1991, and WCCC 1992 [3], the Aegon 1993 and various Aubervilliers Rapid Open - the versions since WCCC 1992 already the Écume codebase, completely written in Assembly language [4].

Description

from Don Beal’s WMCCC 1991 report [5] :

Written by Jean-Christophe Weill, in association with Marc-François Baudot of [Échec](%C3%89chec "Échec"), this is a new program, only in development for 7 months, although it made its first appearance at the [1990 World Micro](WMCCC_1990 "WMCCC 1990"). Its [evaluation function](Evaluation_Function "Evaluation Function") has some overlap with Échec, although Cumulus add [hung-piece](Hanging_Piece "Hanging Piece") considerations, [king safety](King_Safety "King Safety") and uses different definition of [mobility](Mobility "Mobility"). Its [selectivity](Selectivity "Selectivity") is driven by swap-off values and certain mate threats. [Checks](Check_Extensions "Check Extensions"), [promotion threats](Promotions "Promotions"), and [re-captures](Recapture_Extensions "Recapture Extensions") are [extended](Extensions "Extensions").

Selected Games

WCCC 1992, round 4, Cumulus 2 - Kallisto [6]


[Event "WCCC 1992"]
[Site "Madrid, Spain"]
[Date "1992.11.26"]
[Round "4"]
[White "Cumulus 2"]
[Black "Kallisto"]
[Result "1-0"]

1.d4 Nf6 2.Nf3 e6 3.e3 b6 4.Nbd2 Bb7 5.Bd3 Nc6 6.c3 a5 7.O-O Ba6 8.Bxa6 Rxa6 
9.e4 Be7 10.e5 Nh5 11.Ne4 a4 12.Nfg5 g6 13.Qf3 O-O 14.Be3 Ra5 15.g4 Ng7 16.Qh3 
h5 17.b4 axb3 18.axb3 Qa8 19.Rxa5 Qxa5 20.Nf6+ Bxf6 21.exf6 Ne8 22.gxh5 gxh5 
23.Qg3 Kh8 24.Qf3 Kg8 25.Kh1 Qd5 26.Ne4 Qf5 27.Qxf5 exf5 28.Bh6 fxe4 29.Rg1+ 
Ng7 30.Rxg7+ Kh8 31.h4 d6 32.b4 b5 33.Kh2 Na7 34.Rg5 Re8 35.Bg7+ 1-0