MESON Chess Problem Database

Problem Display
PID: 101036 (2Q5/2n5/2R1q2n/8/4k3/2B1N1R1/6N1/4K2B w - - 0 1)

Karlsson, G

Good Companions, 1924

2Q5/2n5/2R1q2n/8/4k3/2B1N1R1/6N1/4K2B

#2

8 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Sf4#
  • Tries
    • 1.Rc4+?
      • 1...Kd3
        • 2.Sf4#
      • 1...Qxc4!
    • 1.Qxe6+?
      • 1...Kd3
        • 2.Sf4#
        • 2.Qc4#
      • 1...Sxe6!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Sh4#
      • 1...Kxd5+
        • 2.Se3#
      • 1...Kf5+
        • 2.Sge3#
      • 1...Qxd5
        • 2.Re3#
      • 1...Sxd5
        • 2.Qxe6#
      • 1...Qh3
        • 2.Sf6#
      • 1...Qg4
        • 2.Sf6#
      • 1...Qf5
        • 2.Sgf4#
      • 1...Qf7
        • 2.Sgf4#
      • 1...Qf6
        • 2.Sgf4#
        • 2.Sxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • K(a);P_PINS(E),S_FLIGHT::S(C)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • K(a);P_PINS(E),S_FLIGHT::S(C)
      • Refutation
        • Q(b);XR(G)
    • Try
      • Q(H);CHECK,XQ(b)
      • Refutation
        • S(d);XQ(H)
  • Actual
    • S(E);
    • Threat
      • B(B)+S(C)
    • Vars
      • K(a);CHECK,S_FLIGHT,XS(E)::B(B)+S(C),DCHECK
      • K(a);CHECK,P_SPINQ(b),S_FLIGHT::S(C)
      • Q(b);SBLOCK,XS(E)::R1(F)
      • S(d);N_GUARD,XS(E)::QAR2(H),XQ(b)
      • Q(b);N_GUARD::S(E)
      • Q(b);::B(B)+S(C)
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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).