MESON Chess Problem Database

Problem Display
PID: 166918 (2B5/8/5ppK/2p2R2/1N2k1pP/3R1q2/4PpN1/7Q w - - 0 1)

Hermanson, Halvar

1st HM., Tidskrift for Schack, 1950

2B5/8/5ppK/2p2R2/1N2k1pP/3R1q2/4PpN1/7Q

#2

9 + 7

23 Die Schwalbe 1965

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg2
      • 2.Qxg2#
    • 1...Qe3+
      • 2.Sxe3#
    • 1...Qf4+
      • 2.Sxf4#
    • 1...g3
      • 2.exf3#
  • Tries
    • 1.Rf4+?
      • 1...Ke5
        • 2.Qa1#
      • 1...Qxf4+!
    • 1.Qc1?
      • threat
        • 2.Qc4#
      • 1...Qe3+
        • 2.Qxe3#
      • 1...Qf4+
        • 2.Qxf4#
      • 1...Qxd3
        • 2.Qf4#
      • 1...Qxf5
        • 2.Qe3#
      • 1...c4
        • 2.Qxc4#
      • 1...gxf5!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qa8#
      • 1...Qe3+
        • 2.Rxe3#
      • 1...Qf4+
        • 2.Rxf4#
      • 1...Qxd3
        • 2.Rf4#
        • 2.exd3#
      • 1...Qxf5
        • 2.Re3#
      • 1...gxf5
        • 2.Bb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(b);OGATE,P_SPINQ(b),XS(C)::QAB(A),XQ(b)
    • Q(b);CHECK::QAB(A)+S(C),XQ(b)
    • P(d);N_GUARD::P(B),XQ(b)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB(A)
      • Refutation
        • Q(b);CHECK,XR(G)
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • Q(b);CHECK,N_GUARD::QAR1(A),XQ(b)
        • Q(b);N_GUARD,XR(D)::QAR1(A)
        • Q(b);N_GUARD,XR(G)::QAR1(A)
        • P(e);::QAR2(A),XP(e)
      • Refutation
        • P(g);XR(G)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • Q(b);CHECK,N_GUARD::R1(D),XQ(b)
      • Q(b);CHECK,N_GUARD::R1(G),XQ(b)
      • Q(b);N_GUARD,XR(G)::R1(D)
      • P(g);SBLOCK,XR(G)::B(I)
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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).