MESON Chess Problem Database

Problem Display
PID: 106779 (3Nb3/3p3Q/3P1kPP/7n/5BK1/6P1/8/8 w - - 0 1)

Rendall, JL

The Field, 1955

(First published on Sat May 21 1955)

3Nb3/3p3Q/3P1kPP/7n/5BK1/6P1/8/8

#2

8 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Bxg6
      • 2.Qe7#
    • 1...Bf7
      • 2.Qxf7#
    • 1...Sxg3
      • 2.Qg7#
    • 1...Sxf4
      • 2.Qg7#
    • 1...Sg7
      • 2.Qxg7#
  • Tries
    • 1.Kxh5?
      • 1...Bxg6+
        • 2.Qxg6#
      • 1...Bf7
        • 2.Qxf7#
      • 1...Kf5!
    • 1.Qg8?
      • 1...Sxg3
        • 2.Qg7#
      • 1...Sxf4
        • 2.Qg7#
      • 1...Sg7
        • 2.Qxg7#
      • 1...Bf7
        • 2.Qxf7#
      • 1...Bxg6!
    • 1.Qxd7?
      • threat
        • 2.Qf5#
        • 2.Qe6#
      • 1...Kxg6
        • 2.Qf5#
      • 1...Bxg6
        • 2.Qe6#
        • 2.Qe7#
      • 1...Sxg3
        • 2.Qe6#
        • 2.Qg7#
      • 1...Sxf4
        • 2.Qf5#
        • 2.Qg7#
      • 1...Bf7
        • 2.Qf5#
        • 2.Qxf7#
      • 1...Sg7
        • 2.Qxg7#
      • 1...Bxd7+!
    • 1.Qh8+?
      • 1...Sg7
        • 2.Qxg7#
      • 1...Kxg6!
  • Keys
    • 1.g7!
      • threat
        • 2.Qf5#
        • 2.g8S#
      • 1...Sxg3
        • 2.g8S#
      • 1...Sxf4
        • 2.Qf5#
      • 1...Sxg7
        • 2.Qxg7#
      • 1...Bg6
        • 2.g8S#
      • 1...Bf7
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • B(d);SBLOCK,XP(E)::QAB1(G)
    • B(d);N_GUARD::QAR1(G),XB(d)
    • S(a);N_GUARD,XP(A)::QAB1(G)
    • S(a);N_GUARD,XB(B)::QAB1(G)
    • S(a);N_GUARD::QAB1(G),XS(a)
  • Tries
    • Try
      • K(C);P_SPINP(E),S_FLIGHT,XS(a)
      • Vars
        • B(d);CHECK,OGATE,XP(E)::QAR1(G),XB(d)
        • B(d);N_GUARD::QAR1(G),XB(d)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(G);
      • Vars
        • S(a);N_GUARD,XP(A)::QAB1(G)
        • S(a);N_GUARD,XB(B)::QAB1(G)
        • S(a);N_GUARD::QAB1(G),XS(a)
        • B(d);N_GUARD::QAR1(G),XB(d)
      • Refutation
        • B(d);XP(E)
    • Try
      • Q(G);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT,XP(E)::QAB1(G)
        • S(a);N_GUARD::QAB1(G),XS(a)
      • Refutation
        • B(d);CHECK,XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(G),XS(a)
      • Refutation
        • K(b);P-FLIGHT,XP(E)
  • Actual
    • P(E);
    • Threat
      • DUALS(2)
    • Vars
      • S(a);XP(A)::P=S
      • S(a);XB(B)::QAR1(G)
      • S(a);OGATE,XP(E)::QAB1(G),XS(a)
      • B(d);::P=S
      • B(d);::QAR1(G)
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).