Three-person chess game board
BACKGROUND AND SUMMARY 
     The basic idea of three-person chess has been exploited in several forms in the prior art, the fundamentals revolving about some form of triangular playing field bearing squares or other markings over which game pieces are moved according to prescribed rules. In some prior art games, the usual checkerboard pattern is modified. In others, the conventional chess set is either added to or subtracted from by the addition of pieces of new names, for example. In cases where the set is reduced, it is normally at least one of the pawns that has been deleted. Usually, the basic rules are modified for the purpose of accommodating the different numbers of pieces or to change the approach to the game. Representative of such patented prior art are the following U.S. Pat. Nos. 3,963,242; 3,744,797 and 3,533,627. 
     The present invention provides significant advances and improvements over such prior art, particularly in the symmetrical form of playing field and its subdivisions, the use of conventional chess sets, the use, at least in part, of basic rules of chess and the introduction into the game of the element of chance, specifically by the use of one die to dictate certain moves of the chess men. Features and advantages other than are complementary to the foregoing will become apparent from the following disclosure of a preferred form of the invention. 
    
    
     DESCRIPTION OF TH DRAWINGS 
     FIG. 1 is a plan of the playing board. 
     FIG. 2 is representative, in part schematic, of the three chess sets employed. 
     FIG. 3 is a perspective of a typical single die that may be used. 
     FIG. 4 is a fragmentary view of part of the board, showing how moves are made from a rectangular field into the triangular area. 
     FIG. 5, is a section showing a modified board having steps therein. 
    
    
     DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION 
     Reference will be had first to FIG. 1, wherein the novel game board is designated in its entirety by the numeral (10). This board, in one form of the invention, has a flat top on which four basic playing fields or areas are imprinted or otherwise delineated. The central area is in the form of an equilateral triangle (12) bordered at its three edges, respectively, by rectangular playing fields A, B and C. These rectangles are identical and accordingly the description of one will suffice for all, with exceptions made where necessary for clarification of the disclosure. Each rectangle has an inner side 14 coincident as to position and length with the associated or adjacent side of the basic central triangle, the rectangles being disposed about the triangle in 120° spaced apart intervals, forming generally Y. The side 14 of a rectangle may be said also to represent the associated side of the basic central triangle (12). Each rectangle further has, of course, an outermost side (16) parallel to its innermost side. The rectangles are of conventional chess or checkerboard style and each has at least two starting rows (18) of eight squares each. In the present instance, each chess &#34;board&#34; has six rows of alternately colored squares. The squares of the rectangles may be of contrasting colors, e.g., black and red. The triangles could be yellow. Considerable latitude is allowed in this area of design and attractiveness. The selection of six rows of squares for each rectangle is based mainly on the usual number of four rows on a standard chess board separating the rows of competing pawns. In the present case, there are four rows between each pawn row and the adjacent innermost side (14) (or coincident triangle side). The number of rows could, of course, be varied. 
     It is a feature of the invention that three sets of conventional chess pieces or men may be used, as represented by the three sets X, Y and Z in FIG. 2. These sets may be of contrasting colors; e.g., a red set, a blue set and a white set. Here again wide variation is permitted without departing from the spirit of the novel game. It is clear, of course, that the sets X, Y and Z will begin the game arrayed in conventional chess fashion on the rectangular fields A, B and C, respectively. 
     The basic central triangle (12) is subdivided into several smaller triangles, specifically three rows of isoceles triangles (20) having their bases aligned on the respective sides (14) and a plurality of identical equilateral small triangles (22) within the isoceles rows. The isoceles triangles are identical to each other and each has a base of such length as to span two squares in the adjacent board row. The other two sides of each isoceles triangle are equal to the sides of the small equilateral triangles. The relationship of the triangles to each other and to the bordering chess board squares is best seen in FIG. 4. The aforesaid pattern establishes ideal symmetry as respects the three chess boards, A, B and C. 
     Although wide latitude may be resorted to in the rules governing the play of the game, it is a significant feature that the game is made more entertaining by the use of means providing an element of chance or &#34;luck&#34;. One such means may take the form of a single die (24) as depicted in FIG. 3. As one variation in this area, additional dice (not shown) may be used; or some form of numbered or lettered spinner (also not shown) could be employed. Each player may have his own die of a color matching his chess set. 
     Fundamentally, the object of the game is, of course, to check mate the opponents&#39; kings. The rules may provide that, initially, each chess piece can be moved in turn according to the usual moves assigned to those pieces accordto standard chess. As the men from board A, for example, advance, they approach the central triangle. At this point, the rules may provide that a roll of the die determines whether the advanced piece can enter the triangle. For example, if the die comes up 1, 2 or 3, advance may be made into the next adjacent triangle (22). Casting of the die is then used to determine how many small triangles (22) may be traversed. The player may be required to announce, before he rolls the die, that he desires to enter the central triangle and which piece he will move. The rules may further provide that a roll of the die must result in numbers 4, 5 or 6 as &#34;permission&#34; to leave the central triangle. 
     If a small triangle (22) is already occupied, the player must move his piece to the nearest empty triangle. Pieces in the triangle may not capture or be captured with one exception: the queen can capture pieces within the central triangle if the number of the die corresponds to the number of spaces the queen must move to make the capture. The queen may also capture pieces while leaving the central triangle, a privilege that may be denied the other pieces. Once a king is inside the triangle, stalemate occurs. Check mate on any opponent means that a piece previously captured from the check mated opponent may be placed within the central triangle by the person effecting the check mate. 
     In the &#34;stepped&#34; form of playing board shown in FIG. 5, the central triangle (12) is elevated and the rows of squares in the adjoining fields A, B and C are stepped down from the triangle (12). The figure has been drawn as a view taken on a &#34;bent&#34; section line. 
     As stated previously, the rules just outlined may be varied, and many variations will occur as the players gain experience. For example, it may be required that 1 on the die must be rolled in order to enter the basic triangle and 2 must be rolled to get out. These and other variations may be resorted to while the basic concept of the three-person board and the use of means providing an element of chance, all without departure from the spirit and scope of the invention.