▁only ▁three ▁players ▁to ▁beat ▁nine ▁und is put ed ▁world ▁champions ▁( the ▁other ▁two ▁are ▁Victor ▁Kor ch no i ▁and ▁Alexander ▁Bel ia v sky ). ▁Other ▁notable ▁grand master s ▁against ▁whom ▁he ▁had ▁plus ▁records ▁include ▁Fine , ▁Flo hr , ▁Vik tor ▁Kor ch no i , ▁E f im ▁G eller , ▁Sav iel ly ▁T art ak ower , ▁Mark ▁Ta iman ov , ▁Milan ▁Vid mar , ▁S vet oz ar ▁G lig ori ć , ▁Isaac ▁B oles lav sky , ▁E f im ▁Bog ol jub ov ▁and ▁Bent ▁Lars en . ▁ ▁He ▁wrote ▁ch ess ▁books ▁that ▁included ▁a ▁well - reg arded , ▁deeply ▁annot ated ▁collection ▁of ▁his ▁best ▁games , ▁Grand master ▁of ▁Ch ess ▁, ▁The ▁Art ▁of ▁the ▁Middle ▁Game ▁( with ▁Alexander ▁Kot ov ) ▁, ▁and ▁Pract ical ▁Ch ess ▁End ings ▁. ▁All ▁three ▁books ▁are ▁still ▁considered ▁among ▁the ▁best ▁of ▁their ▁kind ▁for ▁asp iring ▁master s ▁and ▁exper ts . ▁He ▁also ▁wrote ▁several ▁tournament ▁books , ▁including ▁an ▁account ▁of ▁the ▁ 1 9 4 8 ▁World ▁Championship ▁Match ▁Tournament . ▁He ▁author ed ▁several ▁open ings ▁treat ises , ▁often ▁in ▁German : ▁Span isch ▁bis ▁Fran zös isch , ▁Dre is pring er ▁bis ▁Kon ig sg amb it ▁, ▁and ▁V iers pring er ▁bis ▁Span isch . ▁He ▁contributed ▁to ▁the ▁first ▁volume , ▁' C ', ▁of ▁the ▁first ▁edition ▁of ▁the ▁Y