MESON Chess Problem Database

Problem Display
PID: 63497 (8/4b1p1/2K1Bk1p/2Pp3Q/3N3P/2B5/3q4/5r2 w - - 0 1)

Ellison, Wallace D

Chess, 1945

8/4b1p1/2K1Bk1p/2Pp3Q/3N3P/2B5/3q4/5r2

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qf5#
    • 1...Rb1
      • 2.Qf5#
    • 1...Rc1
      • 2.Qf5#
    • 1...Rd1
      • 2.Qf5#
    • 1...Re1
      • 2.Qf5#
    • 1...Rg1
      • 2.Qf5#
    • 1...Rh1
      • 2.Qf5#
    • 1...Rf5
      • 2.Qxf5#
  • Tries
    • 1.Sf3+?
      • 1...Qxc3
        • 2.Qf7#
        • 2.Qf5#
      • 1...Qd4
        • 2.Qf7#
        • 2.Qf5#
      • 1...d4
        • 2.Qf7#
        • 2.Qf5#
      • 1...Kxe6!
  • Keys
    • 1.Kxd5!
      • threat
        • 2.Qf7#
      • 1...Qg5+
        • 2.Sf5#
      • 1...Qa2+
        • 2.Sb3#
      • 1...Qg2+
        • 2.Sf3#
      • 1...Qxd4+
        • 2.Bxd4#
      • 1...Rf5+
        • 2.Qxf5#
      • 1...g6
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 7
  • Sets
    • R(a);N_GUARD::QAR1(E)
    • R(a);N_GUARD::QAR1(E),XR(a)
  • Tries
    • Try
      • S(B);CHECK
      • Refutation
        • K(d);P-FLIGHT,XB(G)
  • Actual
    • K(F);P_SPINS(B),S_FLIGHT,XP(c)
    • Threat
      • QAR1(E)
    • Vars
      • Q(b);CHECK,N_PINS(B)::B(A)+S(B)
      • Q(b);CHECK,OGATE,P_SPINQ(b),XS(B)::B(A),XQ(b)
      • R(a);CHECK,N_GUARD::QAR1(E),XR(a)
      • P(g);SBLOCK::QAB1(E)
HTML5 logo

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).