MESON Chess Problem Database

Problem Display
PID: 266616 (B7/1n1N4/R7/2bkPP2/p2B4/p3P3/P1P2K2/1Q6 w - - 0 1)

Pepler, CB

Shannon, J

HM., Sunday Referee, 1937

(First published on Sun Nov 14 1937)

B7/1n1N4/R7/2bkPP2/p2B4/p3P3/P1P2K2/1Q6

#2

11 + 5

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.c4#
  • Tries
    • 1.Bxc5?
      • 1...Ke4
        • 2.c4#
      • 1...Kc4!
    • 1.Rxa4?
      • threat
        • 2.Bxb7#
        • 2.Qh1#
        • 2.Qxb7#
      • 1...Ke4
        • 2.c4#
      • 1...Kc6
        • 2.Qxb7#
      • 1...Bb6
        • 2.Bxb7#
        • 2.Qh1#
      • 1...Bb4!
    • 1.Ra5?
      • 1...Ke4
        • 2.c4#
      • 1...Kc6
        • 2.Qxb7#
      • 1...Kc4!
    • 1.Qf1?
      • threat
        • 2.Sf6#
        • 2.Bxb7#
      • 1...Bxd4
        • 2.Bxb7#
      • 1...Bb6
        • 2.Bxb7#
      • 1...Be7
        • 2.Bxb7#
      • 1...Ke4!
  • Keys
    • 1.Rc6!
      • 1...Kc4
        • 2.Sb6#
      • 1...Ke4
        • 2.c4#
      • 1...Kxc6
        • 2.Qxb7#
      • 1...Bxd4
        • 2.Qh1#
      • 1...Bb4
        • 2.Qh1#
      • 1...Bb6
        • 2.Qh1#
      • 1...Bd6
        • 2.Qh1#
      • 1...Ba7
        • 2.Qh1#
      • 1...Be7
        • 2.Qh1#
      • 1...Bf8
        • 2.Qh1#
      • 1...Sa5
        • 2.Rxc5#
      • 1...Sd6
        • 2.Rxc5#
      • 1...Sd8
        • 2.Rxc5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 12
    • REMOVED MATES = 0
  • Sets
    • K(d);N_GUARD,S_FLIGHT::QAB(A)+P(C)
  • Tries
    • Try
      • B(F);XB(c)
      • Vars
        • K(d);N_GUARD,S_FLIGHT::QAB(A)+P(C)
      • Refutation
        • K(d);N_SPINS(e),S_FLIGHT
    • Try
      • R(I);XP(b)
      • Threat
        • DUALS(3)
      • Vars
        • K(d);N_GUARD,S_FLIGHT::QAB(A)+P(C)
        • K(d);S_FLIGHT::QAB1(A),XS(e)
      • Refutation
        • B(c);
    • Try
      • R(I);P_PINB(c)
      • Vars
        • K(d);N_GUARD,N_SPINB(c),S_FLIGHT::QAB(A)+P(C)
        • K(d);N_GUARD,N_SPINB(c),S_FLIGHT::QAB1(A),XS(e)
      • Refutation
        • K(d);N_SPINB(c),N_SPINS(e),S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);P_PINP(E),XB(F)::B(K),XS(e)
        • B(c);::B(K),XS(e)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • R(I);N_PINS(e)
    • Vars
      • K(d);N_GUARD,P_SPINB(c),S_FLIGHT::S(J)
      • K(d);N_GUARD,S_FLIGHT::QAB(A)+P(C)
      • K(d);OGATEB,P_SPINS(e),S_FLIGHT,XR(I)::QAB1(A),XS(e)
      • B(c);P_PINP(E),XB(F)::QAB(A)
      • B(c);::QAB(A)
      • S(e);::B(K)+R(I),DCHECK,XB(c)
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).