Editing Ogre:CharacterCodex:Combat:Sequence (section)

====Ready====
The ready action lets you take an action but resolved it at a later segment. The segments that you let pass this way are lost to you. You can use a ready action to wait for an opponent to do a specific action and break his action.

'''Distracting Spellcasters:''' You can ready an attack against a spellcaster. If you damage the spellcaster, she may lose the spell she was trying to cast (as determined by her Concentration check result).

'''Readying to counter a spell:''' You may ready a counterspell against a spellcaster. In this case, when the spellcaster starts a spell, you get a chance to identify it with a Spellcraft check (DC 15 + spell level). If you do, and if you can cast that same spell (are able to cast it and have it prepared, if you prepare spells), you can cast the spell as a counterspell and automatically ruin the other spellcaster’s spell. Counterspelling works even if one spell is divine and the other arcane.

A spellcaster can use dispel magic to counterspell another spellcaster, but it doesn’t always work.
Readying a Weapon against a Charge: You can ready certain piercing weapons, setting them to receive charges. A readied weapon of this type deals double damage if you score a hit with it against a charging character.