MESON Chess Problem Database

Problem Display
PID: 101049 (7Q/2Kp1r2/p2Pp3/2n1P1Pp/p1R1Nk1P/1p1B2n1/4R2B/8 w - - 0 1)

Kovacs, Norbert

Good Companions, 1921

7Q/2Kp1r2/p2Pp3/2n1P1Pp/p1R1Nk1P/1p1B2n1/4R2B/8

#2

11 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kf3
      • 2.Sd2#
    • 1...Kf5
      • 2.Sxg3#
    • 1...Sb7
      • 2.Sd2#
  • Tries
    • 1.Sxg3+?
      • 1...Kf3
        • 2.Qxh5#
      • 1...Se4!
    • 1.Bxg3+?
      • 1...Kf3
        • 2.Qxh5#
      • 1...Kf5
        • 2.Sxc5#
      • 1...Kg4!
    • 1.Qf6+?
      • 1...Kg4
        • 2.Sf2#
      • 1...Rxf6!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Sxc5#
      • 1...Kf3
        • 2.Sd2#
      • 1...Kg4
        • 2.Sf2#
      • 1...Kxe5
        • 2.Sxc5#
      • 1...Kf5
        • 2.Sxg3#
      • 1...Sxd3
        • 2.Sxg3#
      • 1...Sxe4
        • 2.Qxe4#
      • 1...Sb7
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINS(b),P-FLIGHT::S(E)
    • K(d);N_SPINS(b),P-FLIGHT::B(C)+S(E),DCHECK,XS(b)
    • S(e);N_GUARD::R(D)+S(E)
  • Tries
    • Try
      • S(E);CHECK,XS(b)
      • Vars
        • K(d);P-FLIGHT::QAB(K),XP(f)
      • Refutation
        • S(e);P_SPINS(e)
    • Try
      • B(B);CHECK,XS(b)
      • Vars
        • K(d);P-FLIGHT::QAB(K),XP(f)
        • K(d);P-FLIGHT::B(C)+S(E),XS(e)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(K);CHECK
      • Vars
        • K(d);N_SPINS(b),P-FLIGHT::R(D)+S(E),DCHECK
      • Refutation
        • R(j);XQ(K)
  • Actual
    • Q(K);
    • Threat
      • R(D)+S(E),XS(e)
    • Vars
      • K(d);N_SPINS(b),P-FLIGHT::QAB(K)+S(E),DCHECK
      • K(d);N_SPINS(b),P-FLIGHT::R(D)+S(E),DCHECK
      • K(d);S_FLIGHT,XP(G)::R(A)+S(E),XS(e)
      • K(d);N_SPINS(b),P-FLIGHT::B(C)+S(E),DCHECK,XS(b)
      • S(e);N_GUARD,XB(C)::R(D)+S(E),XS(b)
      • S(e);OGATE,XS(E)::QAR1(K),XS(e)
      • S(e);N_GUARD::R(D)+S(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).