Synthetic si4 version-400 and si5 fixtures authored for Ironwood (GPL-3.0-or-later).
Three identical games: two active, one marked deleted. Hand-encoded index,
name tables and moves: e4 e5 Nf3! (Nc3 Nc6) Nc6, with a move comment.
No third-party chess database content.

The sample-si4.7z and sample-si5.7z files package those synthetic fixtures.
archive.pgn and sample-pgn.7z are an additional original synthetic PGN fixture.
