19 across is center.
18 down is Scotch.
Chess-oriented crossword puzzle
Sort:
3 down is Morphy.
17 down is material.
4 down is pawn.
12 down is castling.
All correct so far, except 4 down - it is not "pawn"!
KageLord wrote:
1 down is sodium
7 down is chain
Correct!
I'm going to answer one of the more difficult ones (IMO):
13 Across: Nakamura
If the crossword is filling slowly I shall return. 
4 down is king.
10 Across: Brady
5 across mephisto
All answers correct!
11 across is Sveshnikov.
2 down capablanca?
"Sveshnikov" is correct!
20 across Bishop?
14 Down: Al Lajlaj
9d golombek
Capablanca for 2 maybe
Again all correct!
Difficulty: moderate.
Answers so far:
Across: 5.Mephisto, 8.Gedult, 10.Brady, 11.Sveshnikov, 13.Nakamura, 15.Rook, 16.Composer, 19.Center, 20.Bishop
Down: 1.Sodium, 2.Capablanca, 3.Morphy, 4.King, 6.Algebraic, 7.Chain, 9.Golombek, 12.Castling, 14.Al Lajlaj, 17.Material, 18.Scotch