MESON Chess Problem Database

Problem Display
PID: 137328 (4nK2/2p5/2B1k3/1N2pp1N/4n3/2p1Q3/3p4/3r4 w - - 0 1)

Heydon, Joseph Kentigern

Australasian Chess Magazine, 1920

4nK2/2p5/2B1k3/1N2pp1N/4n3/2p1Q3/3p4/3r4

#2

5 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...S4d6
      • 2.Sd4#
    • 1...S4f6
      • 2.Sf4#
    • 1...S8d6
      • 2.Sxc7#
    • 1...S8f6
      • 2.Sg7#
    • 1...c2
      • 2.Qb3#
    • 1...f4
      • 2.Qh3#
  • Tries
    • 1.Sg7+?
      • 1...Kf6
        • 2.Qh6#
      • 1...Sxg7!
    • 1.Qh6+?
      • 1...S8f6
        • 2.Sg7#
      • 1...S4f6!
    • 1.Qd3?
      • threat
        • 2.Bd7#
        • 2.Qc4#
        • 2.Qd5#
        • 2.Qd7#
      • 1...f4
        • 2.Bd7#
        • 2.Qh3#
        • 2.Qd7#
      • 1...Sc5
        • 2.Qc4#
        • 2.Qd5#
      • 1...S4d6
        • 2.Qd5#
      • 1...S8d6
        • 2.Sxc7#
        • 2.Qd5#
      • 1...S8f6
        • 2.Sxc7#
        • 2.Sg7#
      • 1...S4f6!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Qc4#
      • 1...f4
        • 2.Qg4#
      • 1...S4f6
        • 2.Sf4#
      • 1...S4d6
        • 2.Sd4#
      • 1...S8d6
        • 2.Sxc7#
      • 1...S8f6
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • S(d);P_SPINP(e),SBLOCK::S(B)
    • S(d);P_SPINP(e),SBLOCK::S(C)
    • S(i);N_GUARD,SBLOCK::S(B),XP(h)
    • S(i);N_GUARD,SBLOCK::S(C)
    • P(c);OGATE::QAB(A)
    • P(f);OGATEB::QAB(A)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(g);P-FLIGHT::QAR2(A)
      • Refutation
        • S(i);XS(C)
    • Try
      • Q(A);CHECK
      • Vars
        • S(i);P_SPINS(i)::S(C)
      • Refutation
        • S(d);P_SPINS(d)
    • Try
      • Q(A);
      • Threat
        • DUALS(4)
      • Vars
        • S(d);::QAB1(A)
      • Refutation
        • S(d);
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • P(f);OGATEB::QAB(A)
      • S(d);P_SPINP(e),SBLOCK::S(C)
      • S(d);P_SPINP(e),SBLOCK::S(B)
      • S(i);N_GUARD,SBLOCK::S(B),XP(h)
      • S(i);N_GUARD,SBLOCK::S(C)
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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).