MESON Chess Problem Database

Problem Display
PID: 139054 (7Q/KB2pp2/3p4/4P3/3k4/1PR2p2/1B1N4/4n1bb w - - 0 1)

Evans, TC

The Problemist, 1937

7Q/KB2pp2/3p4/4P3/3k4/1PR2p2/1B1N4/4n1bb

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sg2
      • 2.Sxf3#
    • 1...dxe5
      • 2.Qd8#
    • 1...f5
      • 2.e6#
  • Tries
    • 1.b4?
      • threat
        • 2.Sb3#
        • 2.Ra3#
        • 2.Rb3#
        • 2.Rxf3#
      • 1...f6
        • 2.Ra3#
        • 2.Rb3#
        • 2.Rxf3#
      • 1...Be3
        • 2.Sb3#
        • 2.Ra3#
        • 2.Rb3#
      • 1...f2
        • 2.Sb3#
        • 2.Ra3#
        • 2.Rb3#
        • 2.Rf3#
        • 2.Rg3#
        • 2.Rh3#
      • 1...d5
        • 2.Ra3#
        • 2.Rb3#
        • 2.Rxf3#
      • 1...Sd3!
  • Keys
    • 1.Qh6!
      • threat
        • 2.Qf4#
      • 1...Kxe5+
        • 2.Rc5#
      • 1...dxe5
        • 2.Qb6#
      • 1...Bh2
        • 2.Qe3#
      • 1...Be3
        • 2.Qxe3#
      • 1...Sg2
        • 2.Sxf3#
      • 1...Sd3
        • 2.Rc4#
      • 1...f2
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD,S_CUTB(c)::S(B),XP(d)
    • P(f);OGATEB,P_SPINP(f),SBLOCK,XP(E)::QAR(H)
    • P(h);N_GUARD::QAB(H)+P(E)
  • Tries
    • Try
      • P(C);
      • Threat
        • DUALS(4)
      • Refutation
        • S(a);
  • Actual
    • Q(H);
    • Threat
      • QAR2(H)
    • Vars
      • K(e);CHECK,S_FLIGHT,XP(E)::B(A)+R(D),DCHECK
      • P(f);OGATE,SBLOCK,XP(E)::QAB(H)
      • B(b);N_GUARD::QAB1(H)
      • B(b);N_GUARD::QAB1(H),XB(b)
      • S(a);N_GUARD,S_CUTB(c)::S(B),XP(d)
      • S(a);SBLOCK::B(A)+R(D),DCHECK
      • P(d);S_CUTB(b)::QAB1(H)
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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).