An Etymological Dictionary of the German Language/Annotated/Schächer
Schächer masculine, ‘robber,’ from the equivalent Middle High German schâchœre, Old High German scâhhâri, masculine, connected with Middle High German schâch, Old High German scâh, masculine, ‘robbery, rapine'; compare Dutch schaak, ‘rape, seduction,’ Old Frisian skâk, ‘booty, robbery,’ Anglo-Saxon sčeâcêre, ‘robber'; Gothic *skêka, ‘robbery,’ is wanting. The Teutonic cognates passed into Romance; compare Old French échec, ‘robbery.’ Other terms related to the Teutonic cognates are not found in the Aryan languages.