MESON Chess Problem Database

Problem Display
PID: 486 (4Q3/2p5/2P1np2/4p1b1/2P1k1P1/KN1rp2N/1p1rn1P1/1B1RRqB1 w - - 0 1)

Driver, John Edward

1st Comm., The Observer, 1956

4Q3/2p5/2P1np2/4p1b1/2P1k1P1/KN1rp2N/1p1rn1P1/1B1RRqB1

#2

12 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...S2f4
      • 2.Rxe3#
  • Tries
    • 1.Qg6+?
      • 1...Qf5
        • 2.Qxf5#
      • 1...f5!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qd5#
      • 1...Rc2
        • 2.Qxd3#
      • 1...Sc3
        • 2.Sxd2#
      • 1...S2f4
        • 2.Rxe3#
      • 1...S6f4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(d);OGATE,P_SPINP(f)::R1(C),XP(f)
  • Tries
    • Try
      • Q(L);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAB1(L),XQ(a)
      • Refutation
        • P(k);P_SPINP(k)
  • Actual
    • Q(L);
    • Threat
      • QAB1(L)
    • Vars
      • R(c);N_GUARD,N_SPINR(e)::QAB1(L),XR(e)
      • S(d);N_PINS(G),P_SPINP(f)::S(G),XR(c)
      • S(d);OGATE,P_SPINP(f)::R1(C),XP(f)
      • S(j);OGATE::QAB1(L)
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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).