MESON Chess Problem Database

Problem Display
PID: 177543 (bBr5/PkP1p3/8/1K1N1N2/4R3/1Q2p1p1/1r4B1/4b3 w - - 0 1)

Jonsson, Christer

6th Place, Nordisk Postsjakk, 1967

bBr5/PkP1p3/8/1K1N1N2/4R3/1Q2p1p1/1r4B1/4b3

#2

9 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb8
      • 2.axb8Q#
      • 2.cxb8Q#
    • 1...e5
      • 2.Sd6#
    • 1...e6
      • 2.Sd6#
  • Tries
    • 1.Rxe7?
      • threat
        • 2.Sd6#
      • 1...Rxb3+
        • 2.Sb4#
      • 1...Rxb8
        • 2.axb8Q#
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Rd8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Bb4!
  • Keys
    • 1.Sdxe7!
      • threat
        • 2.Sd6#
      • 1...Rxb3+
        • 2.Rb4#
      • 1...Rxb8
        • 2.axb8Q#
        • 2.cxb8Q#
      • 1...Rd2
        • 2.Ka5#
      • 1...Rd8
        • 2.cxd8S#
      • 1...Bb4
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • P(f);N_GUARD::S(F)
  • Tries
    • Try
      • R(C);XP(f)
      • Threat
        • S(F)
      • Vars
        • R(b);CHECK,N_GUARD,XQ(B)::B(A)+S(E)
        • R(h);OGATE::PXR(h)=Q
      • Refutation
        • B(a);N_PINQ(B)
  • Actual
    • S(E);XP(f)
    • Threat
      • S(F)
    • Vars
      • R(b);CHECK,N_GUARD,XQ(B)::B(A)+R(C)
      • R(b);N_PINQ(B)::QAR(B)+K(D)
      • R(h);OGATE::PXR(h)=S
      • B(a);N_PINQ(B)::QAB(B)
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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).