Question: On what Date is Tie no 19?
SQL: SELECT "Date" FROM "2-17751811-3" WHERE "Tie no" = '19';

Question: What is the Ti no of the Walsall Home game?
SQL: SELECT "Tie no" FROM "2-17751811-3" WHERE "Home team" = 'Walsall';

Question: What is the Date of Tie no 21?
SQL: SELECT "Date" FROM "2-17751811-3" WHERE "Tie no" = '21';