MESON Chess Problem Database

Problem Display
PID: 229081 (1q6/4p3/8/b3B2b/4B2K/1PR1P2p/nN1R4/k1NQr3 w - - 0 1)

van Dijk, Johannes

De Maasbode, 1926

1q6/4p3/8/b3B2b/4B2K/1PR1P2p/nN1R4/k1NQr3

#2

10 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb3
      • 2.Sxb3#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Rxa2#
      • 1...Qxb3
        • 2.Sxb3#
      • 1...Sxc1
        • 2.Rxc1#
      • 1...Sxc3
        • 2.Ra2#
      • 1...Re2
        • 2.Sxa2#
      • 1...Sb4!
  • Keys
    • 1.Sa4!
      • threat
        • 2.Rxa2#
      • 1...Qxb3
        • 2.Sxb3#
      • 1...Sxc1
        • 2.Rxc1#
      • 1...Sxc3
        • 2.Ra2#
      • 1...Re2
        • 2.Sxa2#
      • 1...Sb4
        • 2.Rc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(h);XP(E)::QAR(B)+S(A),DCHECK,XQ(h)
  • Tries
    • Try
      • S(C);
      • Threat
        • R1(D),XS(c)
      • Vars
        • Q(h);XP(E)::QAR(B)+S(A),DCHECK,XQ(h)
        • S(c);OGATE,P_SPINS(c),XS(A)::B(J)+R(F),DCHECK,XS(c)
        • S(c);P_SPINS(c),XR(F)::R1(D)
        • R(b);N_GUARD,S_CUTB(f)::QAR(B)+S(A),XS(c)
      • Refutation
        • S(c);
  • Actual
    • S(C);
    • Threat
      • R1(D),XS(c)
    • Vars
      • Q(h);XP(E)::QAR(B)+S(A),DCHECK,XQ(h)
      • S(c);OGATE,P_SPINS(c),XS(A)::B(J)+R(F),DCHECK,XS(c)
      • S(c);P_SPINS(c),XR(F)::R1(D)
      • R(b);N_GUARD,S_CUTB(f)::QAR(B)+S(A),XS(c)
      • S(c);N_GUARD,S_CUTB(e)::B(J)+R(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).