MESON Chess Problem Database

Problem Display
PID: 188620 (7Q/3B4/8/6p1/2K3N1/3p2B1/3Rn1k1/6nN w - - 0 1)

Spencer, George Burt

To Alain White, 1945

7Q/3B4/8/6p1/2K3N1/3p2B1/3Rn1k1/6nN

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Kf1
      • 2.Se3#
    • 1...Kf3
      • 2.Qa8#
  • Tries
    • 1.Bc6+?
      • 1...Kf1
        • 2.Sh2#
        • 2.Se3#
        • 2.Rd1#
      • 1...Sf3!
    • 1.Qh2+?
      • 1...Kf1
        • 2.Se3#
        • 2.Rd1#
        • 2.Qf2#
      • 1...Kf3!
    • 1.Qa8+?
      • 1...Kf1
        • 2.Sh2#
        • 2.Se3#
        • 2.Rd1#
      • 1...Kh3
        • 2.Sgf2#
      • 1...Sf3!
  • Keys
    • 1.Qa1!
      • 1...Kxh1
        • 2.Bc6#
      • 1...Kf3
        • 2.Qa8#
      • 1...Kh3
        • 2.Qf1#
      • 1...Sf3
        • 2.Se3#
      • 1...Sh3
        • 2.Bc6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(c);N_SPINS(b),S_FLIGHT::S(E)
    • K(c);N_SPINS(b),S_FLIGHT::QAB(G)
  • Tries
    • Try
      • B(F);CHECK
      • Refutation
        • S(a);
    • Try
      • Q(G);CHECK
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::B(F)+S(E),DCHECK
      • Refutation
        • S(a);
  • Actual
    • Q(G);
    • Vars
      • K(c);N_SPINS(b),P_SPINS(a),S_FLIGHT,XS(A)::B(F)
      • K(c);N_SPINS(b),S_FLIGHT::QAB(G)
      • S(a);SBLOCK::S(E)
      • S(a);N_GUARD,SBLOCK::B(F)
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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).