Slitherine

Any Attacker against Non-Infantry Defender, no rugged defense. Attacker uses ground defense, defender uses ground defense.
Any Attacker against Non-Infantry Defender, rugged defense. Attacker uses ground defense, defender uses ground defense.
Any Attacker against Infantry Defender, no rugged defense. Attacker uses ground defense, defender uses ground defense.
Any Attacker against Infantry Defender, rugged defense. Attacker uses close defense, defender uses ground defense.

Proof:
http://i.imgur.com/zVavD.jpg
http://i.imgur.com/QvfNN.jpg
http://i.imgur.com/D8rM6.jpg
http://i.imgur.com/Wyd33.jpg
http://i.imgur.com/5wrEP.jpg

In that final picture, the battle prediction was 1-1. 1-1 changing to 7-0 is quite extreme. This wasn't just a case of bad RNG, but the predictor was being based on ground defense vs hard attack, when the battle was actually decided by close defense vs hard attack.