UNIONSCHACH, SACHSENSCHACH, and LEAPALE(tr)
To identify cells, I recommend ranks numbered 1-6, levels lettered u-z (the first character of the cell), and the remaining dimension lettered a-f (the middle character, before the rank number). Extending Tunnelchess file groupings, files divide into an Outer Frame of files ua, uf, za, zf; an Outer Wall of files ub-ue, va-ya, vf-yf, zb-ze; an Inner Frame of files vb, ve, yb, ye; an Inner Wall of files vc, vd, wb, we, xb, xe, yc, yd; and a Tunnel of wc, wd, xc, xd. In Leapale the Inner Frame and Wall inherit the Frame and Wall rôle from Tunnelchess. In Unionschach and Sachsenschach the Outer Frame has the Rooks, the Outer Wall the minor pieces, the Tunnel the three-component compounds, and remaining files the two-component compounds. This terminology also helps explain how Stockbrokers move. UNIONSCHACH![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
Unionschach has a back rank exclusively of radial pieces. The above diagram shows the top 3 levels. The 4th level is the mirror image of the 3rd, and the 5th and 6th the same as the 2nd and 1st respectively.
They are in the same numbers as Pawnless Tunnelchess: two imperial couples and four of everything else. This has the advantage that four standard sets, two each of two distinguishable sizes, can be used using all Pawns and small Knights as Stockbrokers, small linepieces as themselves, small Kings as the remaining Queens, large Knights as Unicorns, large linepieces as their own compounds with the Unicorn, and large Kings as Emperors. Promotion requires the usual improvisations. The name is because the arrangement suggests the Union Jack, the flag of Britain. SACHSENSCHACH![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
Sachsenschach has the same arrangement of radial pieces, but with 2 to 4 kinds of coprime oblique leaper filling the 8 empty back-rank cells. The example shown has LEAPALE![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
Leapale starts with the Simple Tunnelchess, Intermediate Tunnelchess (the example above as it is rotationally symmetric, with lower levels extrapolated as with the Unionschach diagram), or Paired Piece Tunnelchess back rank and adds 4 each of 5 types of coprime oblique leaper symmetrically around the outside. Leapale is leaper-heavy, no bad thing in a 3d variant, and especially useful if the Elf is to be used. This is a more diverse family of variants than Sachsenschach, as the three sets of inner-file radial pieces differ in strength. The name is from Leapale Road in the heart of Guildford, the town on the river Wey where Lewis Carroll ended his days. It is also a fitting name for a variant first submitted in 2004, this millennium's first leap year (and most recently updated in 2008, its second), although the honour of first variant alluding to 2004 goes to Ken Franklin's Leap Chess, and it is fitting having the leapers "outside the pale" of the nobility-filled Tunnelchess file ends. Guildford is, like the Runnymede of Magna Carta Chess, in my native county of Surrey, whose own name means "southern part of a kingdom", that is, of the Middlesex of Saxon times. I have since added a page for the related but Courier-influenced Courier Leapale in which the Stockbroker first appeared. THE FRONT RANKAll this page's variants have a front rank filled with STOCKBROKERS. This piece is an enhancement of the Broker of Man and Beast 02: Shield Bearers, hence its name. Like Brokers they can move one step directly forward without capturing, or capture one step in any of the Unicorn's forward directions, but the Stockbroker can also move one step in the Bishop's forward directions. This last kind of move must be noncapturing when staying within the Tunnel, within the Inner Wall and Frame, or within the Outer Wall and Frame; it must be capturing when moving between two of these three groupings. Stockbrokers are, in terms of ratios of capturing to noncapturing moves and moving between inner and outer files, the closest extrapolation of the 2d Pawn to a 3d face-to-face variant with more than 5x5 files.The simplest promotion rule is to any capturable back-rank piece, but there are other options. To avoid the temptation to always promote to Empress, that choice could be restricted to require a capturing arrival on the far rank. Another approach is to allow promotion to Empress only at the end of the Tunnel, two-piece compounds at the end of the Inner Wall/Frame, and simple pieces at the end of the Outer Wall/Frame.
Last modified: Thursday, March 27, 2008 |

Check out Makruk (Thai Chess), our featured variant for March, 2025.