MESON Chess Problem Database

Problem Display
PID: 179130 (3n2B1/4Bq2/R3n3/1P1k3r/2Np1p1p/3P4/4N3/2Q2K2 w - - 0 1)

Eerkes, Allard Pieter

Arbeidermagasinet, 1940

3n2B1/4Bq2/R3n3/1P1k3r/2Np1p1p/3P4/4N3/2Q2K2

#2

9 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qg6
      • 2.Sxf4#
    • 1...Qe8
      • 2.Sxf4#
    • 1...Qg7
      • 2.Sxf4#
    • 1...Qh7
      • 2.Sxf4#
    • 1...Re5
      • 2.Sb6#
    • 1...Sc5
      • 2.Sxf4#
      • 2.Rd6#
    • 1...Sg5
      • 2.Sxf4#
    • 1...Sc7
      • 2.Sxf4#
    • 1...Sg7
      • 2.Sxf4#
    • 1...Sf8
      • 2.Sxf4#
  • Tries
    • 1.Qa3?
      • threat
        • 2.Rd6#
        • 2.Qd6#
      • 1...Qxe7
        • 2.Sxf4#
      • 1...Sc5
        • 2.Sxf4#
        • 2.Rd6#
        • 2.Qxc5#
      • 1...Sc6
        • 2.Qd6#
      • 1...Sb7!
  • Keys
    • 1.Qxf4!
      • threat
        • 2.Sb6#
      • 1...Qxf4+
        • 2.Sxf4#
      • 1...Qxe7
        • 2.Qxd4#
      • 1...Sxf4
        • 2.Sxf4#
      • 1...Sc5
        • 2.Rd6#
      • 1...Sg5
        • 2.Qf5#
      • 1...Sc7
        • 2.Qf3#
      • 1...Sg7
        • 2.Qf3#
      • 1...Sf8
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • Q(g);N_GUARD,P_SPINS(f)::S(C),XP(b)
    • R(e);SBLOCK::S(E)
    • S(f);N_GUARD,P_SPINQ(g)::S(C),XP(b)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);N_GUARD,P_SPINS(f),XB(H)::S(C),XP(b)
        • S(h);::QAR1(A)
      • Refutation
        • S(h);
  • Actual
    • Q(A);P_SPINQ(A),XP(b)
    • Threat
      • S(E)
    • Vars
      • Q(g);CHECK,P_SPINS(f),XQ(A)::S(C),XQ(g)
      • Q(g);N_PINQ(A),P_SPINS(f),XB(H)::QAR1(A),XP(a)
      • S(f);P_SPINQ(g),XQ(A)::S(C),XS(f)
      • S(f);P_SPINQ(g),SBLOCK::R1(G)
      • S(f);P_SPINQ(g),S_CUTR(e)::QAR2(A)
      • S(f);P_SPINQ(g)::QAB(A)
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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).