MESON Chess Problem Database

Problem Display
PID: 139670 (r1n1N3/8/1p6/1Ppk1BK1/r4Pnp/1PB1P3/2P1p3/Q3b2b w - - 0 1)

Clayton, AT

The Problemist, 1937

r1n1N3/8/1p6/1Ppk1BK1/r4Pnp/1PB1P3/2P1p3/Q3b2b

#2

10 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rb4
      • 2.Qxa8#
    • 1...Rc4
      • 2.Qxa8#
    • 1...Rd4
      • 2.Qxa8#
    • 1...Re4
      • 2.Qxa8#
    • 1...Rxf4
      • 2.Qxa8#
    • 1...Sd6
      • 2.Sc7#
  • Tries
    • 1.Be5?
      • threat
        • 2.Sc7#
      • 1...Sxe5
        • 2.Qxe5#
      • 1...c4
        • 2.Qd4#
      • 1...R4a7
        • 2.c4#
      • 1...R8a7!
    • 1.e4+?
      • 1...Rxe4
        • 2.Qxa8#
      • 1...Bxe4!
  • Keys
    • 1.Bb4!
      • threat
        • 2.c4#
      • 1...Rxb4
        • 2.Qxa8#
      • 1...Sxe3
        • 2.Qe5#
      • 1...cxb4
        • 2.Qd4#
      • 1...Bc3
        • 2.Qxh1#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sd6
        • 2.Sc7#
      • 1...c4
        • 2.Sc7#
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • R(d);OGATE::QAB(A),XR(j)
    • R(d);OGATE,XP(F)::QAB(A),XR(j)
    • S(k);SBLOCK::S(J)
  • Tries
    • Try
      • B(D);
      • Threat
        • S(J)
      • Vars
        • S(e);OGATE,XB(D)::QAR1(A),XS(e)
        • P(g);N_GUARD,S_CUTR(d)::QAR1(A)
        • R(d);N_GUARD::P(B)
      • Refutation
        • R(j);
    • Try
      • P(E);CHECK
      • Vars
        • R(d);OGATE,XP(E)::QAB(A),XR(j)
      • Refutation
        • B(b);XP(E)
  • Actual
    • B(D);
    • Threat
      • P(B)
    • Vars
      • R(d);OGATE,XB(D)::QAB(A),XR(j)
      • S(e);N_GUARD,XP(E)::QAR1(A)
      • P(g);N_GUARD,XB(D)::QAR1(A)
      • B(a);OGATE::QAB(A),XB(b)
      • S(e);N_GUARD::QAR1(A),XS(e)
      • S(k);SBLOCK::S(J)
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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).