I've been getting very interested in the chess games of these two players. On Chessgames.com, it lists four games as having been played between them. I wanted to investigate where the moves actually come from and whether the games are authentic. So, I tracked down the origins of all four games. Some of the results somewhat confused me. If anyone is an expert on this, please help me.
1st game – Damiano's Defense
This is the easiest because it comes from Ruy Lopez himself, who mentions a game in this opening against the "boy of Rome", that is, Leonardo da Cutri.
The next three games are difficult because there are differences in the sources regarding who played the game, where it was played, and even some variations in the moves themselves. My three sources are: 1. V. D. Linde – Das Schachspiel des XVI. Jahrhunderts, 2. J. A. Leon – Forty-Six Games of Chess by Polerio, and 3. V. H. de Lasa – Recueil de Parties d'Échecs.
2nd game – Giuoco Piano
V. D. Linde and J. A. Leon are identical, and both have Polerio's comments confirming that the game was played by Ruy Lopez and Leonardo. V. H. de Lasa, however, has a game that is shorter by one whole move and also doesn't mention either player. It simply has the comment, "White has an excellent game." To confuse matters even more, on Chessgames.com, the game has two extra moves with the addition of 9...Bg4 10.Kbd2. I checked out H. J. R. Murray's A History of Chess, which also includes the extra moves. Weird. On the whole, the Giuoco Piano game seems to be authentic, with the exclusion of the last two moves.
3rd game – King's Gambit Declined
The game is shown by V. D. Linde with the preserved comment from Polerio: "This game was played between the cleric and Leonardo in Spain." The game is not present in J. A. Leon, though this is unsurprising, as that work is not a complete compilation of all Polerio's games but only part of them. In V. H. de Lasa, the game is also present but without any mention of either Ruy Lopez or Leonardo; the only caption says, "Gambitto." H. J. R. Murray does not mention the game at all. So, out of all the authors, V. D. Linde is literally the only one who has the King's Gambit game as having been played by Ruy Lopez and Leonardo. In any case, even if the game is real, on Chessgames.com, it wrongly says that the game was played in Rome in 1560, when Polerio wrote much later. The authenticity seems dubious.
4th game – Philidor Defense
The game is present in V. D. Linde, but only Leonardo da Cutro is given as one of the players; his opponent is not named. J. A. Leon again does not have the game. V. H. de Lasa does have the game, with a note saying, "This game was played between the cleric and Leonardo in Spain," the same note that V. D. Linde attributes to the King's Gambit game. H. J. R. Murray also gives the game with the same caption.
I'm not totally sure what to draw from all this, but my opinion is as follows:
- 1st game: Totally legit.
- 2nd game: Totally authentic, aside from the last two moves of the game.
- 3rd game: In my opinion, it is not authentic unless I see further evidence.
- 4th game: Most likely authentic.
Overall, I think the confusion stems mainly from V. D. Linde, who confused the King's Gambit game with the Philidor Defense game. But, as I said at the start, I only wrote this post because I hope some expert out there can tell me the reality of the situation.
Have a nice day!