MESON Chess Problem Database

Problem Display
PID: 87851 (5Q2/2n5/3p1n1r/1R1p2p1/4k1rp/2PNP1pB/2P3K1/4R3 w - - 0 1)

Todd, William R

The Problemist, 1930

5Q2/2n5/3p1n1r/1R1p2p1/4k1rp/2PNP1pB/2P3K1/4R3

#2

9 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.exf4#
    • 1...Sh5
      • 2.Qf3#
    • 1...Sd7
      • 2.Qf3#
    • 1...Sh7
      • 2.Qf3#
    • 1...Sfe8
      • 2.Qf3#
    • 1...Sg8
      • 2.Qf3#
    • 1...d4
      • 2.exd4#
  • Tries
    • 1.Qxh6?
      • threat
        • 2.Qg6#
      • 1...Rf4
        • 2.exf4#
      • 1...Kf5!
    • 1.Qe7+?
      • 1...Se6
        • 2.Qxe6#
      • 1...Kf5!
    • 1.Qxf6?
      • threat
        • 2.Qf3#
      • 1...Rf4
        • 2.Qd4#
        • 2.exf4#
      • 1...Rxf6!
  • Keys
    • 1.Qf7!
      • 1...Kf5
        • 2.e4#
      • 1...Sxb5
        • 2.Qe6#
      • 1...Rh5
        • 2.Qg6#
      • 1...Rf4
        • 2.exf4#
      • 1...Rg6
        • 2.Qxg6#
      • 1...Rh7
        • 2.Qg6#
      • 1...Rh8
        • 2.Qg6#
      • 1...Sh5
        • 2.Qf3#
      • 1...Sd7
        • 2.Qf3#
      • 1...Sh7
        • 2.Qf3#
      • 1...Sfe8
        • 2.Qf3#
      • 1...Sg8
        • 2.Qf3#
      • 1...Sa6
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Sa8
        • 2.Qe6#
      • 1...Sce8
        • 2.Qe6#
      • 1...d4
        • 2.exd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • R(c);OGATE::R(A)+P(F),XR(c)
    • S(h);OGATE::QAB1(I)
    • P(e);OGATE::R(A)+P(F),XP(e)
  • Tries
    • Try
      • Q(I);XR(i)
      • Threat
        • QAB(I)
      • Vars
        • R(c);OGATE::R(A)+P(F),XR(c)
      • Refutation
        • K(b);P_SPINP(e),P_SPINR(c),S_FLIGHT
    • Try
      • Q(I);CHECK
      • Vars
        • S(j);N_GUARD,P_SPINS(j)::QAR2(I),XS(j)
      • Refutation
        • K(b);P_SPINP(e),P_SPINR(c),S_FLIGHT
    • Try
      • Q(I);XS(h)
      • Threat
        • QAB1(I)
      • Refutation
        • R(i);XQ(I)
  • Actual
    • Q(I);
    • Vars
      • K(b);OGATE,P_SPINP(e),P_SPINR(c),P_SPINS(h),S_FLIGHT::P(F)
      • S(j);N_GUARD,XR(H)::QAR2(I)
      • R(i);N_GUARD::QAB(I)
      • R(c);OGATE::R(A)+P(F),XR(c)
      • R(i);N_GUARD::QAB(I),XR(i)
      • S(h);OGATE::QAB1(I)
      • S(j);N_GUARD::QAR2(I)
      • S(j);N_GUARD::QAR2(I),XS(j)
      • P(e);OGATE::R(A)+P(F),XP(e)
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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).