MESON Chess Problem Database

Problem Display
PID: 262509 (4N1K1/3p1P2/2ppkp2/8/8/3N4/4B3/4Q3 w - - 0 1)

Hermanson, Halvar

1st Comm., Europe Echecs, 1972

4N1K1/3p1P2/2ppkp2/8/8/3N4/4B3/4Q3

#2

6 + 5

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...d5
      • 2.Bg4#
    • 1...f5
      • 2.Bf3#
  • Tries
    • 1.Sc7+?
      • 1...Ke7
        • 2.f8Q#
      • 1...Kf5!
    • 1.Sg7+?
      • 1...Ke7
        • 2.f8Q#
      • 1...Kd5!
    • 1.Qb4?
      • threat
        • 2.Qe4#
      • 1...Kd5
        • 2.Sc7#
      • 1...Kf5
        • 2.Qg4#
      • 1...d5
        • 2.Sg7#
      • 1...f5
        • 2.Qxd6#
      • 1...Ke7!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qe4#
      • 1...Kd5
        • 2.Sc7#
      • 1...Kf5
        • 2.Qg4#
      • 1...Ke7
        • 2.Qxf6#
      • 1...d5
        • 2.Qxf6#
      • 1...f5
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::QAR(A)+B(B),DCHECK
    • P(d);SBLOCK::QAR(A)+B(B)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(c);N_GUARD,P-FLIGHT::P=Q
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(E);CHECK
      • Vars
        • K(c);N_GUARD,P-FLIGHT::P=Q
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • K(c);N_GUARD,S_FLIGHT::S(E)
        • K(c);N_GUARD,S_CUTP(d),S_FLIGHT::QAB1(A)
        • P(b);SBLOCK::S(E)
        • P(d);SBLOCK::QAR1(A),XP(b)
      • Refutation
        • K(c);P-FLIGHT,P_SPINP(b)
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • K(c);N_GUARD,S_FLIGHT::S(E)
      • K(c);N_GUARD,S_CUTP(d),S_FLIGHT::QAB1(A)
      • K(c);N_GUARD,P-FLIGHT,P_SPINP(d)::QAB1(A),XP(d)
      • P(b);SBLOCK::QAR1(A),XP(d)
      • P(d);SBLOCK::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).