Glin-Hex Chess

A variant of chess, popularized after the advent of the Megacities. Played on an hexagonal board.

Setup

The board has 91 hexes which incorporate three different colors. It is best if one of the colors is white. The array is as follows:

Note that the array is ordered so that each piece is initially free to move. Also noteworthy is the fact that both the King and Queen defend all three Bishops.

Pieces

The Orthodox Chess pieces (with an extra Bishop and Pawn for each player) are used. "Hex pieces" move differently than those of Orthodox Chess, but their moves are arguably similar.
Hexagonal Chess somewhat strains the familiar concepts of orthogonal and diagonal moves. For the purpose of this writing, these terms will assume the following meanings:
orthogonal move - A move wherein a line piece exits one hex and enters another by crossing a common border. Orthogonal moves are never colorbound.
diagonal move - A move wherein a line piece exits one hex and enters another by following the line which connects their nearest corners.* Diagonal moves are always colorbound.
*This move is not incumbered by pieces lying to the right or the left of the thin line of travel. Pieces crowding the line are simply passed over.

King:

Rook:

Bishop:

Queen:

Knight:

Pawn:

Unlike Orthodox Chess, the HC Pawn has no diagonal moves - only orthogonal moves - although two are at an angle. The Pawn can move passively straight forward, or move to capture 60° to the right or left of straight forward. (See illustration above.)

Rules

1. Pawns have an initial two-step move option
2. En passant captures are allowed.
3. A capturing Pawn, which arrives on a friendly Pawn's starting square, regains its initial two-step move option.**
4. Pawns promote when they arrive on one of the eleven hexes that define the opposite borders of the board.
5. There is no castling.

**The logic here being that such a move does not place the Pawn any closer to the end rank. Moreover, the rule makes it unnecessary to keep track of which Pawns have actually moved.