The Czech Variation, Dutch Variation, Sämisch Variation is a variation of the Slav Defense, catalogued as ECO D19. The line runs 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O O-O 9. Qe2 Ne4 10. g4, reaching the position shown below after 19 half-moves.
White holds the centre with pawns on d4. Development is level at three minor pieces each. It is Black to move after ten moves. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.
On the Slav Defense generally: A solid defense to the Queen's Gambit. Black supports d5 with c6 while keeping the bishop active.
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The Czech Variation, Dutch Variation, Sämisch Variation goes 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O O-O 9. Qe2 Ne4 10. g4. It is a variation of the Slav Defense and is catalogued as ECO D19.
The Czech Variation, Dutch Variation, Sämisch Variation is ECO D19. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Slav Defense.
Stockfish evaluates the position after 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O O-O 9. Qe2 Ne4 10. g4 at +0.59 at depth 18, which is a slight pull for White, within normal opening margins. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
White holds the centre with pawns on d4. Development is level at three minor pieces each. It is Black to move. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.