MESON Chess Problem Database

Problem Display
PID: 262514 (2N5/8/1rp5/3k1K2/1brp3p/2p2P2/6Q1/8 w - - 0 1)

Hermanson, Halvar

5/6 HM., Europe Echecs, 1959

2N5/8/1rp5/3k1K2/1brp3p/2p2P2/6Q1/8

#2

4 + 8

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Qg8#
    • 1...Bc5
      • 2.Qg8#
      • 2.f4#
    • 1...c5
      • 2.f4#
  • Tries
    • 1.Qe2?
      • threat
        • 2.Qe5#
      • 1...Kc5
        • 2.Qe5#
      • 1...Rc5
        • 2.Qe6#
      • 1...c5
        • 2.Qe4#
      • 1...Bd6!
    • 1.Qg3?
      • threat
        • 2.Qe5#
      • 1...Kc5
        • 2.Qe5#
      • 1...Rc5
        • 2.Sxb6#
        • 2.Qg8#
      • 1...Bd6
        • 2.Qxd6#
      • 1...c5
        • 2.Se7#
      • 1...hxg3!
  • Keys
    • 1.Qh2!
      • threat
        • 2.Qe5#
      • 1...Kc5
        • 2.Qe5#
      • 1...Rc5
        • 2.Sxb6#
      • 1...Bd6
        • 2.Qxd6#
      • 1...c5
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(c);SBLOCK::QAB(A)
    • P(h);SBLOCK::QAB(A)+P(B)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(f);P-FLIGHT::QAR2(A)
        • R(c);SBLOCK::QAB1(A)
        • P(h);SBLOCK::QAB1(A)
      • Refutation
        • B(b);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(f);P-FLIGHT::QAR2(A)
        • B(b);N_GUARD::QAR1(A),XB(b)
        • P(h);SBLOCK,S_CUTB(b)::S(D)
      • Refutation
        • P(e);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(f);P-FLIGHT::QAR2(A)
      • R(c);SBLOCK::S(D),XR(g)
      • B(b);N_GUARD::QAR1(A),XB(b)
      • P(h);SBLOCK,S_CUTB(b)::S(D)
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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).