MESON Chess Problem Database

Problem Display
PID: 267391 (1b1r4/6B1/N1p1N1K1/R1pkPQp1/8/1n3P2/1qnpB3/8 w - - 0 1)

Evans, TC

Sunday Referee, 1938

1b1r4/6B1/N1p1N1K1/R1pkPQp1/8/1n3P2/1qnpB3/8

#2

9 + 10

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ba7
      • 2.Sac7#
    • 1...Bc7
      • 2.Saxc7#
    • 1...Sca1
      • 2.Sb4#
    • 1...Se1
      • 2.Sb4#
    • 1...Sa3
      • 2.Sb4#
    • 1...Se3
      • 2.Sb4#
    • 1...Sb4
      • 2.Sxb4#
    • 1...Scd4
      • 2.Sb4#
    • 1...Sba1
      • 2.Rxc5#
    • 1...Sc1
      • 2.Rxc5#
    • 1...Sbd4
      • 2.Rxc5#
  • Tries
    • 1.Sf4+?
      • 1...Kd4
        • 2.Qd3#
      • 1...gxf4!
    • 1.Sec7+?
      • 1...Kd4
        • 2.Qd3#
      • 1...Bxc7!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qe4#
      • 1...Rd6+
        • 2.e6#
      • 1...Kxd4
        • 2.Qd3#
      • 1...Qxd4
        • 2.Qf7#
      • 1...Bxe5
        • 2.Qxe5#
      • 1...Scxd4
        • 2.Sb4#
      • 1...Sbxd4
        • 2.Rxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • B(i);N_GUARD::S(F)
    • B(i);N_GUARD::S(F),XB(i)
    • S(b);N_GUARD::S(F)
    • S(b);N_GUARD::S(F),XS(b)
    • S(d);N_GUARD::R1(C),XP(e)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(f);N_SPINP(e),P-FLIGHT::QAR1(E)
      • Refutation
        • P(g);XS(G)
    • Try
      • S(G);CHECK
      • Vars
        • K(f);N_SPINP(e),P-FLIGHT::QAR1(E)
      • Refutation
        • B(i);XS(G)
  • Actual
    • S(G);
    • Threat
      • QAB1(E)
    • Vars
      • R(j);CHECK,SBLOCK,S_CUTB(i)::QAR(E)+P(D)
      • K(f);N_SPINP(e),OGATEB,P-FLIGHT,XS(G)::QAR1(E)
      • Q(a);SBLOCK,XS(G)::QAB(E)
      • B(i);OGATE,P_SPINB(i),XP(D)::QAR1(E),XB(i)
      • S(b);N_GUARD,SBLOCK,XS(G)::S(F)
      • S(d);N_GUARD,SBLOCK,XS(G)::R1(C),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).