GambitLines.ctg, a ChessBase opening book for engine-engine testing
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GambitLines.ctg is an openingbook that can be used in the ChessBase GUI. 
It is meant for engine-engine testing. The book contains gambit lines 
only: one side has a (small) material advantage, the other side has to 
prove compensation.

Why a book with only gambit lines? Most available (commercial) opening 
books focus on the most topical, most played and most popular chess 
openings, like the Sicilian Defence, the Ruy Lopez, the Queen’s gambit, 
the Nimzo-Indian and so forth. These openings are very solid and widely 
used. Gambits were very popular a long time ago, but nowadays most of 
these gambits are not actively played. Not in human games, not in 
computer games. Gambits are very interesting, though: they can lead to 
very sharp and interesting play. GambitLines.ctg will feed the engines 
with such lines, forcing them to find compensation or to defend 
accurately.  From time to time the engines will be engaged in very 
complicated, sharp and irrational battles, that you will not find when 
solid openings are used.
It is firmly recommended to use the GambitLines.ctg book for both engines in an engine-engine match. For the recommended book settings, see below.

List of gambits present in GambitLines.ctg
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Amongst others, the following gambits are present in the GambitLines book:

* Albin Counter gambit
* Benko gambit
* Blackmar-Diemer gambit
* Blumenfeld gambit
* Budapest gambit
* Caro-Kann Fantasy gambit
* Caro-Kann Rasa-Studier gambit
* Danish gambit
* Dutch Defence Korchnoi gambit
* Dutch Defence Staunton gambit
* Elephant gambit
* Evans gambit
* Fajarowicz gambit
* Falkbeer Counter gambit
* Four Knights Belgrade gambit
* French Milner-Barry gambit
* French Wing gambit
* King’s gambit
* Latvian gambit
* Lisitsin gambit
* Petroff Cochrane gambit
* Ponziani Counter gambit
* Ruy Lopez Hector gambit
* Ruy Lopez Marshall gambit
* Ruy Lopez Schliemann/Jaenisch gambit
* Scandinavian Mieses gambit
* Scandinavian Icelandic gambit
* Scandinavian Portuguese gambit
* Scotch Goring gambit
* Scotch gambit
* Semi-Slav Anti-Meran gambit
* Semi-Slav Marshall gambit
* Semi-Slav Anti-Moscow gambit
* Sicilian Rubinstein Counter gambit
* Sicilian Smith-Morra gambit
* Sicilian Wing gambit
* Slav Tolusch-Geller gambit
* Tarrasch Defence Marshall gambit
* Tarrasch Defence Von Hennig-Schara gambit
* Trompovski gambit
* Two Knights Fried Liver attack
* Two Knights gambit
* Two Knights Traxler gambit
* Vienna Game Frankenstein-Dracula gambit
* Urusov gambit

Recommended settings (see menu option 'book options')
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First, make sure that the options 'Use book' and 'Tournament book' are 
both switched ‘on’.

The recommended settings are:

• Slider Variety of play: about in the middle
• Slider Influence of learn value: to the far left (= switched off)
• Slider Learning strength: to the far left (= switched off)
• Option Minimum games: choose 5
• Option Up to move: choose 35

It is strongly recommended to switch the book learning ‘off’, i.e. the 
sliders ‘Influence of learn value’ and ‘Learning strength’ should be to 
the far left. When learning is switched on, there is the possibility 
that one engine finds out that one gambit is winning and thus keeps 
repeating it again and again, spoiling the fun!