MESON Chess Problem Database

Problem Display
PID: 141554 (7k/4R1R1/7n/5p2/8/1K1p4/8/b3Qb1r w - - 0 1)

Buchwald, Julius

Comm., Die Schwalbe 141. TT, 1967

7k/4R1R1/7n/5p2/8/1K1p4/8/b3Qb1r

#2

4 + 7

SOLUTION

  • SOUND
  • Tries
    • 1.Re8+?
      • 1...Sg8
        • 2.Rexg8#
      • 1...Kxg7!
    • 1.Qxa1?
      • threat
        • 2.Rg1#
        • 2.Rg2#
        • 2.Rg3#
        • 2.Rg4#
        • 2.Rg5#
        • 2.Rg6#
      • 1...Rg1
        • 2.Rxg1#
        • 2.Rg2#
        • 2.Rg3#
        • 2.Rg4#
        • 2.Rg5#
        • 2.Rg6#
      • 1...Rh2
        • 2.Rg2#
      • 1...Rh4
        • 2.Rg4#
      • 1...Be2
        • 2.Rg1#
      • 1...Bh3
        • 2.Rg1#
      • 1...Sg4
        • 2.Re8#
        • 2.Rxg4#
        • 2.Qa8#
      • 1...Sf7
        • 2.Re8#
      • 1...Sg8
        • 2.Rh7#
      • 1...Bg2!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Rh7#
      • 1...Bxg7
        • 2.Qxg7#
      • 1...Sg4
        • 2.Qb8#
      • 1...Sf7
        • 2.Re8#
      • 1...Sg8
        • 2.Rxg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::R1(C),XS(f)
      • Refutation
        • K(g);S_FLIGHT,XR(D)
    • Try
      • Q(A);XB(a)
      • Threat
        • DUALS(6)
      • Vars
        • R(c);::QAB(A)+R(D)
        • B(b);::QAB(A)+R(D)
        • S(f);N_GUARD::R(C)
        • S(f);SBLOCK::QAB(A)+R(D),DCHECK
      • Refutation
        • B(b);
  • Actual
    • Q(A);
    • Threat
      • R1(D)
    • Vars
      • B(a);OGATE,XR(D)::QAB1(A),XB(a)
      • S(f);N_GUARD::QAR(A)
      • S(f);N_GUARD::R(C)
      • S(f);N_GUARD::R1(D),XS(f)
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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).