MESON Chess Problem Database

Problem Display
PID: 91618 (8/3N1nb1/K2B2R1/3N1kq1/4R3/8/8/7Q w - - 0 1)

Boersma, Kornelis Thomas

Probleemblad, 1961

8/3N1nb1/K2B2R1/3N1kq1/4R3/8/8/7Q

#2

7 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Se7#
    • 1...Qd2
      • 2.Se7#
    • 1...Qe3
      • 2.Se7#
    • 1...Qf4
      • 2.Se7#
    • 1...Qh6
      • 2.Se7#
    • 1...Qe7
      • 2.Sxe7#
    • 1...Qg1
      • 2.Se7#
    • 1...Qg3
      • 2.Se7#
    • 1...Qg4
      • 2.Se7#
    • 1...Qh5
      • 2.Se7#
  • Tries
    • 1.Rf4+?
      • 1...Qxf4
        • 2.Se7#
      • 1...Kxg6!
    • 1.Rxg5+?
      • 1...Sxg5
        • 2.Se7#
      • 1...Kxg5!
    • 1.Qf3+?
      • 1...Qf4
        • 2.Se7#
      • 1...Kxg6!
  • Keys
    • 1.Rg4!
      • threat
        • 2.Qe4#
      • 1...Kxg4
        • 2.Se3#
      • 1...Kxg6
        • 2.Se7#
      • 1...Qxg4
        • 2.Se7#
      • 1...Sxd6
        • 2.R4xg5#
      • 1...Qe3
        • 2.Sxe3#
      • 1...Qf4
        • 2.Se7#
      • 1...Qe7
        • 2.Sxe7#
        • 2.Qf3#
        • 2.Qf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::S(C)
    • Q(b);N_GUARD::S(C),XQ(b)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • Q(b);XR(B)::S(C)
      • Refutation
        • K(a);S_FLIGHT,XR(F)
    • Try
      • R(F);CHECK,XQ(b)
      • Vars
        • S(c);SBLOCK,XR(F)::S(C)
      • Refutation
        • K(a);P-FLIGHT,XR(F)
    • Try
      • Q(A);CHECK
      • Vars
        • Q(b);P_SPINQ(b)::S(C)
      • Refutation
        • K(a);S_FLIGHT,XR(F)
  • Actual
    • R(B);
    • Threat
      • QAB1(A)
    • Vars
      • K(a);P_SPINQ(b),S_FLIGHT,XR(B)::S(C)
      • K(a);P_SPINQ(b),S_FLIGHT,XR(F)::S(C)
      • Q(b);N_GUARD,XR(B)::S(C)
      • S(c);N_GUARD,XB(E)::R1(B),XQ(b)
      • Q(b);N_GUARD::S(C),XQ(b)
      • Q(b);N_GUARD::S(C)
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).