MESON Chess Problem Database

Problem Display
PID: 21913 (7k/6b1/5nK1/4R3/2B5/8/1B6/8 w - - 0 1)

Jakab, Arpad

Chess Amateur (The), 1922

7k/6b1/5nK1/4R3/2B5/8/1B6/8

#2

4 + 3

2012 Miniature Chess Problems from Many Countries 1981
2838 Fun with Chess Miniatures 1996
56 The Problemist 2009
5454 Near Snap 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Se4
      • 2.Rh5#
      • 2.Re8#
    • 1...Sg4
      • 2.Re8#
    • 1...Sd5
      • 2.Re8#
    • 1...Sh5
      • 2.Rxh5#
      • 2.Re8#
    • 1...Sd7
      • 2.Rh5#
    • 1...Se8
      • 2.Rh5#
      • 2.Rxe8#
  • Tries
    • 1.Rh5+?
      • 1...Bh6
        • 2.Bxf6#
        • 2.Rxh6#
      • 1...Sh7
        • 2.Bxg7#
        • 2.Rxh7#
      • 1...Sxh5!
    • 1.Re8+?
      • 1...Bf8
        • 2.Bxf6#
        • 2.Rxf8#
      • 1...Sg8
        • 2.Bxg7#
        • 2.Rxg8#
      • 1...Sxe8!
  • Keys
    • 1.Re7!
      • 1...Sd5
        • 2.Re8#
      • 1...Bh6
        • 2.Rh7#
      • 1...Bf8
        • 2.Rh7#
      • 1...Se4
        • 2.Bxg7#
        • 2.Re8#
      • 1...Sg4
        • 2.Bxg7#
        • 2.Re8#
      • 1...Sh5
        • 2.Re8#
      • 1...Sd7
        • 2.Bxg7#
      • 1...Sh7
        • 2.Bxg7#
      • 1...Se8
        • 2.Rxe8#
      • 1...Sg8
        • 2.Bxg7#

This anticipates 139959(1967)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD,S_CUTB(b)::R(C)
  • Tries
    • Try
      • R(C);CHECK
      • Refutation
        • S(a);P_SPINB(b),XR(C)
    • Try
      • R(C);CHECK
      • Refutation
        • S(a);P_SPINB(b),XR(C)
  • Actual
    • R(C);
    • Vars
      • S(a);N_GUARD,P_SPINB(b)::R(C)
      • B(b);OGATE,P_SPINS(a)::R1(C)
      • S(a);OGATE,P_SPINB(b)::B(A),XB(b)
      • S(a);N_GUARD,P_SPINB(b)::R(C),XS(a)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).