411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...Nf6/2. c4/2...g6/3. Nc3/3...Bg7/4. e4/4...d6/5. f3/5...O-O/6. Be3/6...e5
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Sämisch variation Sämisch variation E85-E89
6...e5 · Orthodox variation
This used to be the main line of the Sämisch. Its use has been in steady decline for a whileKing's Indian Defense: Sämisch, Orthodox Variation https://www.chess.com/openings/Kings-Indian-Defense-Samisch-Orthodox-Variation www.chess.com due to 6...c5 becoming the most ambitious way to play the Sämisch variation.
White has the choice to either leave the central tension, or to release it.
/7. d5/ advances the pawn further into Black's territory. It's presence, however, is only temporary, as Black will be able to get rid of it with 7...c6. This is the main continuation.
/7. Nge2/ leaves the central tension and prioritizes development instead. While Black has the option of taking the pawn, they often choose to play moves that transpose back into 7. d5 instead.
/7. dxe5/ releases the tension in the centre and initiates a trade of queens after 7...dxe5 8. Qxd8 Rxd8.
Theory table
7. d5 c6 8. Bd3 cxd5 7. ... Nh5 8. Qd2 f5 7. Nge2 c6 8. Qd2 Nbd7 7. dxe5 dxe5 8. Qxd8 Rxd8
References
King's Indian Defence, Sämisch Variation