MESON Chess Problem Database

Problem Display
PID: 269323 (B3Q3/2b1B1K1/4pP2/2p1kN2/2p2rp1/R5P1/3N4/3R4 w - - 0 1)

Godal, Ivar

Postsjakk, 1965

B3Q3/2b1B1K1/4pP2/2p1kN2/2p2rp1/R5P1/3N4/3R4

#2

10 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf5
      • 2.Qh5#
    • 1...Rxf5
      • 2.Sxc4#
    • 1...exf5
      • 2.Bxc5#
  • Tries
    • 1.Sxc4+?
      • 1...Kxf5
        • 2.Qh5#
        • 2.Qg6#
      • 1...Rxc4!
    • 1.Bd6+?
      • 1...Kxf5
        • 2.Qh5#
        • 2.Qg6#
      • 1...Bxd6!
    • 1.Re1+?
      • 1...Kxf5
        • 2.Qh5#
        • 2.Qg6#
      • 1...Re4!
    • 1.Re3+?
      • 1...Kxf5
        • 2.Qh5#
        • 2.Qg6#
      • 1...Re4!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Sxc4#
      • 1...Kxd4
        • 2.Sf3#
      • 1...Rxd4
        • 2.Qh5#
      • 1...cxd4
        • 2.Qb5#
      • 1...c3
        • 2.Sc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • K(e);OGATEB,P-FLIGHT,XS(E)::QAR2(J)
    • R(b);N_GUARD,SBLOCK,XS(E)::S(B),XP(a)
    • P(f);OGATEB,SBLOCK,XS(E)::QAR(J)+B(G),XP(d)
  • Tries
    • Try
      • S(B);CHECK,XP(a)
      • Refutation
        • R(b);XS(B)
    • Try
      • B(G);CHECK,P_PINP(f)
      • Refutation
        • B(g);XB(G)
    • Try
      • R(A);CHECK
      • Refutation
        • R(b);P_SPINR(b)
    • Try
      • R(C);CHECK
      • Refutation
        • R(b);P_SPINR(b)
  • Actual
    • S(E);
    • Threat
      • S(B),XP(a)
    • Vars
      • K(e);S_FLIGHT,XS(E)::R(A)+S(B),DCHECK
      • R(b);N_GUARD,SBLOCK,XS(E)::QAR(J)
      • P(d);OGATEB,SBLOCK,XS(E)::QAR(J)
      • P(a);::S(B)
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).