MESON Chess Problem Database

Problem Display
PID: 252378 (1Bb3Q1/rp2P2p/p4pN1/4Pkb1/2R4p/5N1q/K3P1nr/6RB w - - 0 1)

Karlsson, Lennart

Schackvarlden, 1940

1Bb3Q1/rp2P2p/p4pN1/4Pkb1/2R4p/5N1q/K3P1nr/6RB

#2

11 + 12

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Sd4#
    • 1...Se3
      • 2.Sd4#
    • 1...Sf4
      • 2.Sd4#
    • 1...hxg6
      • 2.Qxc8#
  • Tries
    • 1.Rf4+?
      • 1...Sxf4
        • 2.Sd4#
      • 1...Bxf4!
    • 1.e8S?
      • threat
        • 2.Se7#
        • 2.Sd6#
      • 1...hxg6
        • 2.Sd6#
        • 2.Sg7#
      • 1...Bf4
        • 2.Se7#
      • 1...b5
        • 2.Sd6#
      • 1...b6
        • 2.Sd6#
      • 1...fxe5!
  • Keys
    • 1.Sf8!
      • threat
        • 2.Qxh7#
      • 1...fxe5
        • 2.Qxg5#
      • 1...Bf4
        • 2.e4#
      • 1...Sf4
        • 2.Sd4#
      • 1...h5
        • 2.Qh7#
        • 2.Qg6#
      • 1...h6
        • 2.Qh7#
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • S(a);P_PINP(D)::S(E)
    • P(k);SBLOCK,XS(H)::QAB(K),XB(l)
  • Tries
    • Try
      • R(F);CHECK
      • Vars
        • S(a);P_PINP(D),XR(F)::S(E)
      • Refutation
        • B(f);XR(F)
    • Try
      • P(I);
      • Threat
        • DUALS(2)
      • Vars
        • B(f);::S(H)
        • P(j);::S(I)
      • Refutation
        • P(h);XP(G)
  • Actual
    • S(H);
    • Threat
      • QAB(K),XP(k)
    • Vars
      • P(h);N_GUARD,XP(G)::QAR1(K),XB(f)
      • B(f);SBLOCK::P(D)
      • S(a);P_PINP(D),SBLOCK::S(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).