In the Ruy Lopez chess game between Harvard and Yale there has been an exchange of centre pawns:
YALE. HARVARD.
14. P takes P. 14. Kt takes P.
In the Scotch Opening Harvard is exchanging pieces, in order to maintain the advantage of her odd pawn.
HARVARD. YALE.
15. Kt. takes B. 14. Q R - Q sq.
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ENGLISH 6.