User blog comment:CreatorTheta/Only 48 People can Pass Beacons initiation/@comment-3146930-20130917103400

If it is a standard chess board set up, limited to the use of 10 pieces as there are only 20 pillars, you would have 2 of every piece, including pawns. However instead of 2 kings and 2 queens, there is most likely one of each and whoever picked the king and queen were paired up.

2 Rooks+2 Knights+2Bishops+2 Pawns+1 King+1 Queen =20 pieces