Chess Board
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The Tennison Gambit (aka. Lemberg G.)

Black's QPawn directly challenged White's KP.
White offers a gift pawn by developing his King's Knight to KB3(f6) - a dubious gambit invented by U.S. ex-Dane Otto Tennison in 1891 and revived by Wagner (b. in Lemberg) in 1917. Best refuted by 2..PxP, 3.Kt-Kt5..P-K4!, 3.KtxKP..P-KB4. W-Alt.
     White   Black
 1.  P-K4    P-Q4
 2.  Kt-KB3?!	  Main route via Reti.O

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Chess Board

BLACK moves King's Pawn:

P-K4 (e5) or P-K3 (e6) ?

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