chess-The Oxford Companion to Chess - First Edition by David Hooper & Kenneth Whyld

entre. AIso 414 in the spaNrss opENrNc wnen
M'NoR FrEc6 are erchansed (ec , AsxER).
The Exchange Variation of the Queen's Ganbit
Declined is oflen the prelude to a mi.ority adack
by Whire. After 1d4d5 2 c4 e6 he may exchange
at varioN siages: 3 c!d5, or 3 Nc3 Nf6 4 cxds, or
3 Nc3Nf6 4Bg5Nbd7 5e3c6 6dd5,avanatio.
that avoids rhe CAMBRTDGE sP
ln the Spanish Opening all defetr@s based on 3
. . . a6 would be invalidated ir4 Bxc6 (414) wcre ro
favou White, bur this has no1 been proved by Ruy
L6pEz or anyone else. In lhe 1960s F,scsm
succeslully pl.yed 4 Bxc6 drc6 5 00, a li.e
EXEIBIIION GAME, a game played in public lor
enteriaiment as distinct fron a dalch or tournaoentgame.In
single combat a clock is often nsed
and mastem take su.h Aames *riously, having
rhen reptrrafons in nind. In siBuhaneous dnpbys
EZRA 109
a matcr mccts many opponents at ihe same tine
and il their number is more lhin ten. clocks are
EXPOSED (ING, a kitrg unprolcred by ils own
pawns (nore ruely Pieces) and, in consqlen@,
EZRA, ABRAHAM BEN MEIR IBN (..1092
..1167), author oI *veral Hebrew works otr chess.
He was bom in Tudela, Spain, and worted as a
philospher. poe1, and malhematiciao in l1aly,
Franc€. England, and Egrpt. He wrote the 6Bt
chess poems in HebreN, the most tahous beine fte
'Song of Chess , Hj!worksshcdligbton ihclavsol
play in his time; lhey were rhe sane 6 those o{
sH^T uNr excpt for the introdnction ol rhe ms\
leap, shich suSgests that this {as the liNl oodilica
tion of the las nade by nedicval European