Changes

the second chess program by [[Jean-Christophe Weill]] and [[Marc-François Baudot]], written in [[C]] with a few [[8086]] [[Assembly]] snippets <ref>[http://recherche.enac.fr/~weill/chess.html A Short Story of JCW's Computer Chess Program] by [[Jean-Christophe Weill]]</ref>. Cumulus played the [[WMCCC 1990]], [[WMCCC 1991]], and [[WCCC 1992]] <ref> [https://www.game-ai-forum.org/icga-tournaments/program.php?id=225 Cumulus' ICGA Tournaments]</ref>, the [[Aegon 1993]] and various [[Aubervilliers Rapid Open]]- the versions since [[WCCC 1992]] already the [[Écume]] codebase, completely written in Assembly language <ref>[http://recherche.enac.fr/~weill/chess.html A Short Story of JCW's Computer Chess Program] by [[Jean-Christophe Weill]]</ref>.

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

* [[Various Classifications#Meteorology|MeteorologyÉcume]]