MESON Chess Problem Database

Problem Display
PID: 71429 (4n2q/K1p5/1pr5/3bQ1p1/4n1N1/5BB1/4N1P1/b6k w - - 0 1)

Hartong, Jan

Chess, 1951

4n2q/K1p5/1pr5/3bQ1p1/4n1N1/5BB1/4N1P1/b6k

#2

7 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qh3
      • 2.gxh3#
    • 1...Rc3
      • 2.Qxh8#
    • 1...Rf6
      • 2.Qxa1#
    • 1...Sd2
      • 2.Sf2#
    • 1...Sf2
      • 2.Sxf2#
    • 1...Sc3
      • 2.Sf2#
    • 1...Sc5
      • 2.Sf2#
    • 1...S4d6
      • 2.Sf2#
    • 1...S4f6
      • 2.Sf2#
  • Tries
    • 1.Bh4?
      • threat
        • 2.Qh2#
        • 2.g3#
      • 1...Qxe5
        • 2.g3#
      • 1...Qxh4
        • 2.g3#
      • 1...Bxe5
        • 2.g3#
      • 1...Qf6
        • 2.Qh2#
      • 1...Qf8
        • 2.Qh2#
      • 1...Rc3
        • 2.Qh2#
      • 1...Rf6
        • 2.Qxa1#
        • 2.Qh2#
      • 1...Sd2
        • 2.Sf2#
        • 2.Qh2#
      • 1...Sf2
        • 2.Sxf2#
        • 2.Qh2#
      • 1...Sc3
        • 2.Sf2#
        • 2.Qh2#
      • 1...Sc5
        • 2.Sf2#
        • 2.Qh2#
      • 1...S4d6
        • 2.Sf2#
        • 2.Qh2#
      • 1...S4f6
        • 2.Sf2#
        • 2.Qh2#
      • 1...Sg3!
    • 1.Qxa1+?
      • 1...Rc1
        • 2.Qxh8#
        • 2.Qxc1#
      • 1...Qxa1+!
    • 1.Qxh8+?
      • 1...Rh6
        • 2.Qxa1#
        • 2.Qxh6#
      • 1...Bxh8!
  • Keys
    • 1.Bf2!
      • threat
        • 2.g3#
      • 1...Sxf2
        • 2.Sxf2#
      • 1...Qf6
        • 2.Qh2#
      • 1...Qh2
        • 2.Qxh2#
      • 1...Qh3
        • 2.gxh3#
      • 1...Qf8
        • 2.Qh2#
      • 1...Rc3
        • 2.Qxh8#
      • 1...Rf6
        • 2.Qxa1#
      • 1...Sd2
        • 2.Sg3#
      • 1...Sc3
        • 2.Sg3#
      • 1...Sg3
        • 2.Sxg3#
      • 1...Sc5
        • 2.Sg3#
      • 1...S4d6
        • 2.Sg3#
      • 1...S4f6
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(j);OGATE::B(C)+P(B),XQ(j)
    • R(g);N_GUARD,S_CUTB(a)::QAB(F),XQ(j)
    • R(g);N_GUARD,S_CUTQ(j)::QAB1(F),XB(a)
    • S(c);N_GUARD::S(E)
    • S(c);N_GUARD::S(E),XS(c)
  • Tries
    • Try
      • B(D);
      • Threat
        • DUALS(2)
      • Vars
        • Q(j);XQ(F)::B(C)+P(B)
        • Q(j);XB(D)::B(C)+P(B)
        • B(a);XQ(F)::B(C)+P(B)
        • Q(j);::QAR1(F)
        • R(g);::QAR1(F)
      • Refutation
        • S(c);
    • Try
      • Q(F);CHECK,XB(a)
      • Refutation
        • Q(j);CHECK,XQ(F)
    • Try
      • Q(F);CHECK,XQ(j)
      • Refutation
        • B(a);XQ(F)
  • Actual
    • B(D);
    • Threat
      • B(C)+P(B)
    • Vars
      • S(c);XB(D)::S(E),XS(c)
      • Q(j);N_GUARD::QAR1(F)
      • Q(j);N_GUARD::QAR1(F),XQ(j)
      • Q(j);OGATE::B(C)+P(B),XQ(j)
      • R(g);N_GUARD,S_CUTB(a)::QAB(F),XQ(j)
      • R(g);N_GUARD,S_CUTQ(j)::QAB1(F),XB(a)
      • S(c);N_GUARD::S(A)
      • S(c);N_GUARD::S(A),XS(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).