MESON Chess Problem Database

Problem Display
PID: 200039 (1N4B1/2pNb3/p3rr2/Rb1k1P2/1n6/2P2PB1/4Qn2/5K2 w - - 0 1)

Walton, FW

The Observer, 1947

(First published on Sun Aug 3 1947)

1N4B1/2pNb3/p3rr2/Rb1k1P2/1n6/2P2PB1/4Qn2/5K2

#2

10 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf5
      • 2.Bxe6#
    • 1...Rf8
      • 2.Bxe6#
    • 1...Bc5
      • 2.Sxf6#
    • 1...Sfd3
      • 2.Qe4#
    • 1...Se4
      • 2.fxe4#
    • 1...Sbd3
      • 2.Qa2#
    • 1...c5
      • 2.Sb6#
  • Tries
    • 1.Kxf2?
      • threat
        • 2.Qe4#
      • 1...Sd3+
        • 2.Qxd3#
      • 1...Rf7
        • 2.Qxe6#
      • 1...Bc5+!
    • 1.Rxb5+?
      • 1...Bc5
        • 2.Sxf6#
        • 2.Rxc5#
      • 1...c5
        • 2.Sb6#
      • 1...axb5!
    • 1.Qxb5+?
      • 1...Bc5
        • 2.Sxf6#
        • 2.Qxc5#
      • 1...c5
        • 2.Sb6#
      • 1...axb5!
  • Keys
    • 1.Be5!
      • threat
        • 2.c4#
      • 1...Sfd3
        • 2.Qe4#
      • 1...Sbd3
        • 2.Qa2#
      • 1...Bc5
        • 2.Sxf6#
      • 1...c5
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • R(g);N_GUARD,XP(G)::B(J),XR(f)
    • R(g);N_GUARD::B(J),XR(f)
    • B(i);N_GUARD,N_SPINB(c),SBLOCK::S(H),XR(g)
    • S(a);N_PINQ(B)::QAB1(B)
    • S(a);OGATE::P(D),XS(a)
    • S(b);N_PINQ(B)::QAB(B)
    • P(h);N_GUARD,N_SPINB(c),SBLOCK::S(H)
  • Tries
    • Try
      • K(A);N_SPINQ(B),P-FLIGHT,XS(a)
      • Threat
        • QAB1(B)
      • Vars
        • S(b);CHECK,N_GUARD::QAR2(B),XS(b)
        • R(g);N_GUARD,N_SPINR(f)::QAB1(B),XR(f)
      • Refutation
        • B(i);CHECK,N_SPINB(c)
    • Try
      • R(F);CHECK,N_SPINQ(B),XB(c)
      • Vars
        • P(h);P_SPINP(h)::S(H)
      • Refutation
        • P(e);XR(F)
    • Try
      • Q(B);CHECK,N_SPINQ(B),XB(c)
      • Vars
        • P(h);P_SPINP(h)::S(H)
      • Refutation
        • P(e);P_SPINP(e),XQ(B)
  • Actual
    • B(E);
    • Threat
      • P(C)
    • Vars
      • S(a);N_PINQ(B)::QAB1(B)
      • S(b);N_PINQ(B)::QAB(B)
      • B(i);N_GUARD,N_SPINB(c),SBLOCK::S(H),XR(g)
      • P(h);N_GUARD,N_SPINB(c),SBLOCK::S(H)
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).