Chess without pawns

Introduction

It is possible that this way of playing on a chessboard is an old format of chess. Indirectly, this is indicated: the presence of the army of each player of the four types of soldiers (in the ancient documents) that there is no pawns on the board (I think moved a pawn on the chessboard of the ancient Indian game of dice - where each of the four players, four chips - a total of 16 pawns) that the game is not the queen (of course). The last word I leave it to the archaeologists, if they find the original - will be great!

Rules

• Standard board. Each player has 6 figures and 2 Kings. The initial position of white on the front side: rooks a1, h1; riders b1, g1; bishops c1, f1 kings d1, e1 and the black was built in the same order in the eighth horizontal. FFEN: rnbkkbnr/8/8/8/8/8/8/RNBKKBNR
• Quiet moves:
  All figures and Kings perform as well as in standard chess, note: each king can make a castling - long or short.
• Active moves:
  Figures threaten King (declare them shahi)
  Kings of the attack on such figures, which have no protection.
• The winner is the player who reached any of the three goals:

1. Checkmate the opponent's king (as well as in chess).
2. Announced Shahi, from which there is no security; rescue of two kings of the enemy can not (the game ends, destroy kings is not required).
3. Acting King removed from the board the figure of an enemy that was not protected (the condition: none of the kings of the player should not depend upon the enemy figures).
   or make a move, which both achieved several goals. If both opponents three times repeated their moves, then draw.

Sample Game

1. .... Kb7-c8 2.Bd8-c7+ Kd6-c6 3.Na4-b6+ Kc8-b7 4.Bb3-d5(2) 1. .... Nb5-c7 2.Bd8-e7+ Kd6-c6 3.Ne2-d4+ Kc6-d7 4.Na4-c5(2) 1. .... Kb7-c8 2.Bd8-c7+ Kd6-c6 3.Ne2-d4+ Kc6-b7 4.Na4-b6(1)

1. .... Kb7-a6 2.Bd8-c7+ Kd6-c6 3.Ne2-d4+ Kc6-b7 4.Na4-c5(2) 1. .... Be6-d7 2.Bd8-e7+ Kd6-c7 3.Na4-c5+ Kb7-a7 4.Nc5-e6+ Kc7-b7 5.Kg2:h3(3) 1. .... Kb7-a8 2.Na4-b6+ Ka8-b8 3.Bd8-e7(2)

Notes

• Starting position: White - Ka1, Ra2, Rb1, Nb3, Nc2. Black - Kh8, Rg8, Rh7, Nf7, Ng6. FFEN: 6rk/5n1r/6n1/8/8/1N6/R1N5/KR6
• All the rules are identical with the "Chess without pawns", except for: the king did not castling, victory only methods 1 and 3.