MESON Chess Problem Database

Problem Display
PID: 185139 (3N1B2/3p1P2/4P1p1/4k1r1/1N2pR2/8/2K1PQ2/8 w - - 0 1)

Evans, TC

The Observer, 1930

(First published on Sun Jul 27 1930)

3N1B2/3p1P2/4P1p1/4k1r1/1N2pR2/8/2K1PQ2/8

#2

9 + 5

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...e3
      • 2.Qxe3#
    • 1...dxe6
      • 2.Sdc6#
    • 1...d5
      • 2.Sbc6#
    • 1...d6
      • 2.Bg7#
  • Tries
    • 1.Sd3+?
      • 1...Kd5
        • 2.Qc5#
      • 1...exd3+!
    • 1.Sbc6+?
      • 1...Kd5
        • 2.Qd4#
        • 2.Qc5#
      • 1...dxc6!
    • 1.Sdc6+?
      • 1...Kxe6
        • 2.Rf6#
      • 1...dxc6!
    • 1.Qe3?
      • threat
        • 2.Qxe4#
      • 1...d5
        • 2.Sd3#
        • 2.Sbc6#
      • 1...Rf5!
    • 1.Qc5+?
      • 1...d5
        • 2.Bd6#
      • 1...Kxf4!
  • Keys
    • 1.Qh4!
      • 1...Kd4
        • 2.Rxe4#
      • 1...dxe6
        • 2.Sdc6#
      • 1...Rg4
        • 2.Qf6#
      • 1...Rg1
        • 2.Qf6#
      • 1...Rg2
        • 2.Qf6#
      • 1...Rg3
        • 2.Qf6#
      • 1...Rf5
        • 2.Rxe4#
      • 1...Rh5
        • 2.Qf6#
      • 1...e3
        • 2.Qxg5#
      • 1...d5
        • 2.Sbc6#
      • 1...d6
        • 2.Bg7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::QAR2(C),XP(a)
    • P(e);N_GUARD,SBLOCK,XP(F)::S(H)
    • P(e);N_GUARD,SBLOCK::S(D)
    • P(e);SBLOCK::B(I)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
      • Refutation
        • P(a);CHECK,XS(D)
    • Try
      • S(D);CHECK
      • Refutation
        • P(e);XS(D)
    • Try
      • S(H);CHECK
      • Vars
        • K(b);P-FLIGHT,XP(F)::R1(E)
      • Refutation
        • P(e);XS(H)
    • Try
      • Q(C);P_PINP(a)
      • Threat
        • QAR1(C),XP(a)
      • Refutation
        • R(c);
    • Try
      • Q(C);CHECK
      • Vars
        • P(e);P_SPINP(e)::B(I)
      • Refutation
        • K(b);S_FLIGHT,XR(E)
  • Actual
    • Q(C);
    • Vars
      • K(b);P_SPINP(a),S_FLIGHT::R1(E),XP(a)
      • P(e);N_GUARD,SBLOCK,XP(F)::S(H)
      • R(c);OGATE::QAB1(C)
      • R(c);OGATE,P_PINP(B)::QAB1(C)
      • R(c);SBLOCK::R1(E),XP(a)
      • P(a);::QAR2(C),XR(c)
      • P(e);N_GUARD,SBLOCK::S(D)
      • P(e);SBLOCK::B(I)
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).