MESON Chess Problem Database

Problem Display
PID: 147847 (1B1q4/2r2N2/r4Rp1/3p1bN1/4Pk2/1RQ3pP/1nKP4/3n4 w - - 0 1)

Easter, Norris

2nd Prize, Bristol Times and Mirror, 1929/II

1B1q4/2r2N2/r4Rp1/3p1bN1/4Pk2/1RQ3pP/1nKP4/3n4

#2

10 + 10

35 L'Italia Scacchistica 1930

SOLUTION

  • SOUND
  • Sets
    • 1...Se3+
      • 2.dxe3#
    • 1...Sc4
      • 2.Qf3#
      • 2.Qxg3#
  • Tries
    • 1.Se6+?
      • 1...Kxe4
        • 2.Sfg5#
      • 1...Rxe6!
    • 1.Bxc7+?
      • 1...Qd6
        • 2.Qf3#
        • 2.Qxg3#
      • 1...Rd6
        • 2.Qe5#
        • 2.Qf3#
        • 2.Qxg3#
      • 1...Qxc7!
    • 1.Qxc7+?
      • 1...Qd6
        • 2.Rf3#
      • 1...Rd6
        • 2.Rf3#
      • 1...Qxc7+!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Rf3#
      • 1...Se3+
        • 2.dxe3#
      • 1...Ra3
        • 2.Se6#
      • 1...Sc3
        • 2.Qf1#
      • 1...Sd3
        • 2.exd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);CHECK,OGATE::P(B),XS(a)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(d);N_SPINB(f),N_SPINR(i),P-FLIGHT,XP(F)::S(I)
      • Refutation
        • R(g);XS(G)
    • Try
      • B(J);CHECK,N_SPINQ(D),XR(i)
      • Refutation
        • Q(j);P_PINQ(D),XB(J)
    • Try
      • Q(D);CHECK,N_SPINQ(D),XR(i)
      • Vars
        • Q(j);P_SPINQ(j)::R1(C)
        • R(g);P_SPINR(g)::R1(C)
      • Refutation
        • Q(j);CHECK,P_SPINQ(j),XQ(D)
  • Actual
    • Q(D);
    • Threat
      • R1(C)
    • Vars
      • S(a);CHECK,OGATE::P(B),XS(a)
      • R(g);N_GUARD::S(G)
      • S(a);N_PINQ(D)::QAR(D)
      • S(b);N_PINP(F)::QAR(D)+P(F),XP(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).