MESON Chess Problem Database

Problem Display
PID: 51625 (8/p1Kp4/R1nr1P2/1P1kpB2/NP1b1pN1/3Q1P2/b7/1n6 w - - 0 1)

Barrow, John Hugh

The Observer, 1923

(First published on Sun May 27 1923)

8/p1Kp4/R1nr1P2/1P1kpB2/NP1b1pN1/3Q1P2/b7/1n6

#2

10 + 10

5257 Chess Problems by J H Barrow 2004
15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Re6
      • 2.Be4#
    • 1...Rxf6
      • 2.Sxf6#
    • 1...Bb3
      • 2.Qxb3#
    • 1...Bc4
      • 2.Qe4#
    • 1...Sd2
      • 2.Sc3#
    • 1...Sa3
      • 2.Sc3#
    • 1...Sc3
      • 2.Sxc3#
    • 1...Sxb4
      • 2.Rxd6#
    • 1...Sa5
      • 2.Rxd6#
    • 1...Se7
      • 2.Rxd6#
    • 1...Sb8
      • 2.Rxd6#
    • 1...Sd8
      • 2.Rxd6#
    • 1...e4
      • 2.fxe4#
  • Tries
    • 1.Ra5?
      • threat
        • 2.bxc6#
      • 1...Sxb4
        • 2.b6#
      • 1...Bc4
        • 2.Qe4#
      • 1...Sa3
        • 2.Sc3#
      • 1...Sc3
        • 2.Sxc3#
      • 1...Se7
        • 2.b6#
      • 1...Sb8
        • 2.b6#
      • 1...Sd8
        • 2.b6#
      • 1...Sxa5!
  • Keys
    • 1.b6!
      • 1...Rxf6
        • 2.Sxf6#
      • 1...Sxb4
        • 2.Ra5#
      • 1...axb6
        • 2.Sxb6#
      • 1...Sd2
        • 2.Sc3#
      • 1...Re6
        • 2.Be4#
      • 1...Bb3
        • 2.Qxb3#
      • 1...Bc4
        • 2.Qe4#
      • 1...Sa3
        • 2.Sc3#
      • 1...Sc3
        • 2.Sxc3#
      • 1...Sa5
        • 2.Rxa5#
      • 1...Se7
        • 2.Ra5#
      • 1...Sb8
        • 2.Ra5#
      • 1...Sd8
        • 2.Ra5#
      • 1...e4
        • 2.fxe4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 5
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(h);SBLOCK::B(G)
    • R(h);XP(I)::S(E),XR(h)
    • B(b);N_GUARD::QAB(A),XB(b)
    • B(b);SBLOCK::QAB1(A)
    • S(a);N_GUARD::S(C)
    • S(a);N_GUARD::S(C),XS(a)
    • S(g);OGATE,XP(D)::R1(H),XR(h)
    • S(g);OGATE::R1(H),XR(h)
    • P(f);OGATE::P(B),XP(f)
  • Tries
    • Try
      • R(H);
      • Threat
        • R(H)+P(F),XS(g)
      • Vars
        • S(g);N_GUARD,XP(D)::R(H)+P(F)
        • B(b);SBLOCK::QAB1(A)
        • S(a);N_GUARD::S(C)
        • S(a);N_GUARD::S(C),XS(a)
        • S(g);N_GUARD::R(H)+P(F)
      • Refutation
        • S(g);XR(H)
  • Actual
    • P(F);
    • Vars
      • R(h);XP(I)::S(E),XR(h)
      • S(g);N_GUARD,XP(D)::R(H)
      • P(i);XP(F)::S(C),XP(i)
      • S(a);N_GUARD::S(C)
      • R(h);SBLOCK::B(G)
      • B(b);N_GUARD::QAB(A),XB(b)
      • B(b);SBLOCK::QAB1(A)
      • S(a);N_GUARD::S(C),XS(a)
      • S(g);N_GUARD::R(H),XS(g)
      • S(g);N_GUARD::R(H)
      • P(f);OGATE::P(B),XP(f)
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).