MESON Chess Problem Database

Problem Display
PID: 276810 (8/5p2/4p3/K3k2r/5NRp/BPN1p3/n6Q/1B5n w - - 0 1)

Hermanson, Halvar

To Mat, 1956

8/5p2/4p3/K3k2r/5NRp/BPN1p3/n6Q/1B5n

#2

8 + 8

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4+
      • 2.Sfd5#
    • 1...Kf6+
      • 2.Sxh5#
    • 1...Sf2
      • 2.Sfd5#
      • 2.Sxh5#
    • 1...f6
      • 2.Sg6#
  • Tries
    • 1.Sd3+?
      • 1...Kf5
        • 2.Qf4#
      • 1...Kf6+!
    • 1.Bd6+?
      • 1...Kd4+
        • 2.Sfd5#
      • 1...Kf6+
        • 2.Sxh5#
      • 1...Kxd6+!
  • Keys
    • 1.Qb2!
      • threat
        • 2.Sxa2#
      • 1...Kd4+
        • 2.Sb5#
      • 1...Kf6+
        • 2.Scd5#
      • 1...Sxc3
        • 2.Qxc3#
      • 1...Sb4
        • 2.Sb5#
      • 1...Sc1
        • 2.Sd1#
        • 2.Sa2#
        • 2.Sce2#
        • 2.Sa4#
        • 2.Sb5#
        • 2.Scd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(e);CHECK,S_CUTS(a),S_FLIGHT::R(G)+S(F)
    • K(e);CHECK,S_CUTS(a),S_FLIGHT::S(F),XR(f)
    • P(h);SBLOCK::QAB(B)+S(F),DCHECK
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(e);P-FLIGHT::QAR1(B)
      • Refutation
        • K(e);CHECK,S_FLIGHT
    • Try
      • B(C);CHECK
      • Vars
        • K(e);CHECK,S_FLIGHT::R(G)+S(F)
        • K(e);CHECK,S_FLIGHT::S(F),XR(f)
      • Refutation
        • K(e);CHECK,S_FLIGHT,XB(C)
  • Actual
    • Q(B);
    • Threat
      • QAB(B)+S(E),XS(b)
    • Vars
      • K(e);CHECK,S_FLIGHT::QAB(B)+S(E),DCHECK
      • S(b);OGATE,P_SPINS(b),XS(E)::QAB(B),XS(b)
      • S(b);N_GUARD::QAB(B)+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).