MESON Chess Problem Database

Problem Display
PID: 58624 (3r1b1n/7N/5r1q/2p2pQ1/2P1k2p/2KN4/4P2p/B3RR1b w - - 0 1)

van der Straat, Frits P

Het Belgisch Schaakbord (L'Echiquier Belge), 1955

3r1b1n/7N/5r1q/2p2pQ1/2P1k2p/2KN4/4P2p/B3RR1b

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qg7
      • 2.Qf4#
    • 1...Qh5
      • 2.Sxf6#
      • 2.Qf4#
    • 1...Qg6
      • 2.Qf4#
    • 1...Qxh7
      • 2.Qf4#
    • 1...Rxd3+
      • 2.exd3#
    • 1...Bf3
      • 2.exf3#
    • 1...Sg6
      • 2.Sxf6#
    • 1...f4
      • 2.Qe5#
  • Tries
    • 1.Qe3+?
      • 1...Qxe3
        • 2.Sxf6#
      • 1...Kxe3!
  • Keys
    • 1.Kd2!
      • threat
        • 2.Rf4#
      • 1...Qxg5+
        • 2.Sxg5#
      • 1...Rxd3+
        • 2.exd3#
      • 1...Bf3
        • 2.exf3#
      • 1...Bd6
        • 2.Sf2#
      • 1...Sg6
        • 2.Sxf6#
      • 1...f4
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(h);N_GUARD::QAR1(H)
    • Q(h);N_GUARD,XS(I)::QAR1(H)
    • R(i);CHECK,OGATE,XS(F)::R(B)+P(D)DCHECK,XR(i)
    • B(a);OGATE::R(B)+P(D)DCHECK,XB(a)
    • S(k);S_CUTQ(h)::S(I),XR(g)
    • P(f);OGATE::QAR1(H)
  • Tries
    • Try
      • Q(H);CHECK
      • Vars
        • Q(h);P_PINS(F),SBLOCK,XQ(H)::S(I),XR(g)
      • Refutation
        • K(c);P-FLIGHT,XQ(H)
  • Actual
    • K(E);P_SPINQ(H),P_SPINS(F),S_FLIGHT
    • Threat
      • R1(C)
    • Vars
      • Q(h);CHECK,XQ(H)::S(I),XQ(h)
      • R(i);CHECK,OGATE,XS(F)::R(B)+P(D)DCHECK,XR(i)
      • B(a);OGATE::R(B)+P(D)DCHECK,XB(a)
      • B(j);N_PINS(F)::S(F)
      • S(k);S_CUTQ(h)::S(I),XR(g)
      • P(f);N_PINQ(H)::QAR1(H)
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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).