MESON Chess Problem Database

Problem Display
PID: 268513 (3B4/4bp1n/4kN2/1pR3p1/2n1N1P1/5K2/B7/3R4 w - - 0 1)

Stallybrass, Don HR

The Problemist, 1956

3B4/4bp1n/4kN2/1pR3p1/2n1N1P1/5K2/B7/3R4

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bd6
      • 2.Rxd6#
    • 1...Bxf6
      • 2.Rd6#
    • 1...Sxf6
      • 2.Sxg5#
    • 1...b4
      • 2.Bxc4#
  • Tries
    • 1.Rc6+?
      • 1...Ke5
        • 2.Sd7#
        • 2.Rd5#
      • 1...Bd6!
  • Keys
    • 1.Rdd5!
      • threat
        • 2.Re5#
      • 1...Sd2+
        • 2.Rxd2#
      • 1...Se5+
        • 2.Rxe5#
      • 1...Bxc5
        • 2.Sxc5#
      • 1...Bxf6
        • 2.Rd6#
      • 1...Sxf6
        • 2.Sxg5#
      • 1...Bd6
        • 2.Rxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(e);N_GUARD::R1(A),XB(e)
    • B(e);N_GUARD,XS(G)::R1(A)
    • S(g);N_GUARD,SBLOCK,XS(G)::S(D),XP(c)
    • P(b);N_GUARD::B(B),XS(a)
  • Tries
    • Try
      • R(F);CHECK
      • Refutation
        • B(e);P_SPINB(e)
  • Actual
    • R(A);N_PINS(a)
    • Threat
      • R1(A)
    • Vars
      • S(a);CHECK,OGATEB::B(B)+R(A),XS(a)
      • S(a);CHECK::B(B)+R(A),DCHECK,XS(a)
      • B(e);XR(F)::S(D),XB(e)
      • B(e);N_GUARD,XS(G)::R1(A)
      • S(g);N_GUARD,SBLOCK,XS(G)::S(D),XP(c)
      • B(e);N_GUARD::R1(A),XB(e)
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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).