N. J. Collar has published a paper in the most recent Forktail detailing a proposed split in the Greater Flameback complex, which is highly variable in the Philippines. I've only seen three, looks like a trip to Negros is warranted...
Luzon Flameback. Chrysocolaptes haematribon. Luzon, Polillo, Marinduque, Catanduanes
Buff-spotted Flameback. Chrysocolaptes lucidus.
C. l. rufopunctatus. Samar, Biliran, Leyte, Calicoan, Bohol, Panoan
C. l. lucidus. Basilan, W. Mindanao
C. l. montanus. C & E Mindanao, Samal
Yellow-faced Flameback. Chrysocolaptes xanthocephalus. Ticao, Masbate, Guimares, Negros, Panay
Red-headed Flameback. Chrysocolaptes erythrocephalus. Palawan, Balabac and Calamian group
In addition to these four the Palawan race of Common Flameback has also been split, creating yet another Philippine endemic woodpecker.
Spot-throated Flameback. Dinopium everetti. Balabac, Busuanga, Culion, Palawan
An amazing looking bird, this is a female, the male has no yellow speckling on the crown.
The most boring of the four! This is probably a juvenile male. The adult male has a striking red crest, and the female has no red on the crest, this has some red, but not as much as I'd expect from an adult.
Another splendid bird, the red back is quite striking. This is a female, the male has a red crest.