MESON Chess Problem Database

Problem Display
PID: 487 (3B1bB1/2p3pK/r1p5/1Rp1kn1Q/4r2p/3Rp2q/3NN3/8 w - - 0 1)

Swords, WJ

1st Comm., The Observer, 1956

3B1bB1/2p3pK/r1p5/1Rp1kn1Q/4r2p/3Rp2q/3NN3/8

#2

8 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.Sf3#
    • 1...Qf3
      • 2.Sxf3#
    • 1...cxb5
      • 2.Rd5#
  • Tries
    • 1.Qf7?
      • threat
        • 2.Qe6#
      • 1...cxb5
        • 2.Rd5#
        • 2.Qd5#
      • 1...Sd4
        • 2.Sc4#
      • 1...Sg3
        • 2.Sf3#
      • 1...Sd6
        • 2.Rxc5#
      • 1...Se7
        • 2.Bxc7#
      • 1...Sh6!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qe6#
      • 1...cxb5
        • 2.Rd5#
      • 1...Sg3
        • 2.Sf3#
      • 1...Sd4
        • 2.Sc4#
      • 1...Sd6
        • 2.Rxc5#
      • 1...Sh6
        • 2.Qxe4#
      • 1...Se7
        • 2.Bxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(b);N_GUARD::S(A)
    • Q(b);N_GUARD::S(A),XQ(b)
    • P(i);N_GUARD,N_SPINP(e),XR(D)::R1(C)
  • Tries
    • Try
      • Q(E);N_PINS(g)
      • Threat
        • QAR1(E)
      • Vars
        • S(g);S_CUTR(c)::S(A)
        • S(g);S_CUTQ(b)::S(A)
        • S(g);S_CUTB(l)::R(D),XP(e)
        • S(g);N_GUARD,S_CUTB(l)::B(G),XP(j)
      • Refutation
        • S(g);
  • Actual
    • Q(E);N_PINS(g)
    • Threat
      • QAR1(E)
    • Vars
      • P(i);N_GUARD,N_SPINP(e),XR(D)::R1(C)
      • S(g);S_CUTQ(b)::S(A)
      • S(g);S_CUTR(c)::S(A)
      • S(g);S_CUTB(l)::R(D),XP(e)
      • S(g);OGATE::QAR1(E),XR(c)
      • S(g);N_GUARD,S_CUTB(l)::B(G),XP(j)
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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).