MESON Chess Problem Database

Problem Display
PID: 90796 (n7/K3Q3/ppP1p3/3pkp1N/q3P3/2PP2rP/4N2n/B3R3 w - - 0 1)

Hermanson, Halvar

Die Schwalbe, 1964

n7/K3Q3/ppP1p3/3pkp1N/q3P3/2PP2rP/4N2n/B3R3

#2

11 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.cxd4#
    • 1...Sc7
      • 2.Qxc7#
  • Tries
    • 1.Sef4?
      • threat
        • 2.Qxe6#
      • 1...Qxc6
        • 2.d4#
      • 1...Rg6
        • 2.Sxg6#
      • 1...Sc7
        • 2.Qxc7#
      • 1...Rg7!
    • 1.c4+?
      • 1...d4
        • 2.Bxd4#
      • 1...Qxa1!
    • 1.exf5?
      • threat
        • 2.Qxe6#
      • 1...Kxf5
        • 2.Qf6#
      • 1...Qxc6
        • 2.Sexg3#
      • 1...Rg7
        • 2.Sd4#
      • 1...Rg6
        • 2.Sd4#
      • 1...Sc7!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qxe6#
      • 1...Qxc6
        • 2.Sxc6#
      • 1...Qxd4
        • 2.cxd4#
      • 1...Rg6
        • 2.exf5#
      • 1...Rg7
        • 2.exf5#
      • 1...Sc7
        • 2.Qxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(c);OGATE::P(D),XQ(c)
    • S(j);N_GUARD::QAB(K),XS(j)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAR1(K),XP(i)
      • Vars
        • Q(c);N_GUARD,XP(I)::P(E)
        • R(b);N_GUARD::S(C),XR(b)
        • S(j);N_GUARD::QAB(K),XS(j)
      • Refutation
        • R(b);P_PINQ(K)
    • Try
      • P(D);CHECK
      • Vars
        • P(d);N_SPINP(i),P_SPINP(d)::B(A),XP(d)
      • Refutation
        • Q(c);XB(A)
    • Try
      • P(G);XP(f)
      • Threat
        • QAR1(K),XP(i)
      • Vars
        • K(e);N_SPINP(i),P-FLIGHT,XP(G)::QAR1(K)
        • Q(c);N_GUARD,XP(I)::R(B)+S(C),XR(b)
        • R(b);N_GUARD,P_PINQ(K)::R(B)+S(C)
        • R(b);N_GUARD::R(B)+S(C)
      • Refutation
        • S(j);
  • Actual
    • S(C);
    • Threat
      • QAR1(K),XP(i)
    • Vars
      • Q(c);XP(I)::S(C),XQ(c)
      • Q(c);OGATE,XS(C)::P(D),XQ(c)
      • R(b);N_GUARD::R(B)+P(G),XP(f)
      • R(b);N_GUARD,P_PINQ(K)::R(B)+P(G),XP(f)
      • S(j);N_GUARD::QAB(K),XS(j)
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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).