オープニング (チェス)
セミオープンゲーム (1.e4)

白の「1.e4」に対し、黒が「1.… e5」とは別の手で応じる場合である。対称形を初手から崩してしまう手であり、双方の力量が試される。
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1.e4 a6 …… St. George Defence
1.e4 b6 …… Owen's Defence
1.e4 c5 …… シシリアン・ディフェンス
1.e4 c6 …… カロ・カン・ディフェンス
1.e4 d5 …… センター・カウンター・ディフェンス
1.e4 d6 …… ピルツ・ディフェンス
1.e4 e6 …… フレンチ・ディフェンス
1.e4 e6 2.d4 c5 …… Franco-Benoni Defence
1.e4 f5? …… チャイニーズ・ギャンビット
1.e4 g5?! …… Grob Defence
1.e4 g6 …… Modern Defence
1.e4 Nc6 …… ニムゾヴィッチ・ディフェンス
1.e4 Nf6 …… アレヒン・ディフェンス
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