MESON Chess Problem Database

Problem Display
PID: 188583 (8/1Q1p1b2/2r1R3/p1p5/6N1/1N3kpP/K3R3/2B5 w - - 0 1)

Myers, Sheldon

To Alain White, 1945

8/1Q1p1b2/2r1R3/p1p5/6N1/1N3kpP/K3R3/2B5

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...c4
      • 2.Sd4#
    • 1...d5
      • 2.Qxf7#
    • 1...d6
      • 2.Qxf7#
  • Tries
    • 1.Qxc6+?
      • 1...d5
        • 2.Qxd5#
      • 1...dxc6!
    • 1.Qb5?
      • threat
        • 2.Se5#
        • 2.Qd3#
      • 1...g2
        • 2.Qd3#
      • 1...Rd6
        • 2.Se5#
      • 1...Bg6
        • 2.Se5#
      • 1...c4
        • 2.Sd4#
        • 2.Qd5#
        • 2.Qf5#
      • 1...d6
        • 2.Rf6#
        • 2.Qd3#
      • 1...Rxe6!
  • Keys
    • 1.R6e4!
      • threat
        • 2.Se5#
      • 1...Bxb3+
        • 2.Qxb3#
      • 1...g2
        • 2.R2e3#
      • 1...Re6
        • 2.Sd2#
      • 1...d6
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • P(d);N_GUARD::S(D)
    • P(f);N_SPINR(e),OGATE::QAR(H),XB(g)
    • P(f);OGATE::QAR(H),XB(g)
  • Tries
    • Try
      • Q(H);CHECK,XR(e)
      • Vars
        • P(f);P_SPINP(f)::QAB(H),XP(f)
      • Refutation
        • P(f);XQ(H)
    • Try
      • Q(H);N_PINR(e)
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAR2(H)
        • R(e);::S(F)
        • B(g);::S(F)
      • Refutation
        • R(e);XR(G)
  • Actual
    • R(G);N_PINR(e),P_SPINS(D)
    • Threat
      • S(F)
    • Vars
      • B(g);CHECK,OGATE,XS(D)::QAR(H),XB(g)
      • P(b);SBLOCK::R1(C)
      • R(e);N_PINS(D)::S(D)
      • P(f);OGATE::QAR(H),XB(g)
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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).