MESON Chess Problem Database

Problem Display
PID: 272212 (1bn3b1/5np1/r7/3P1pQ1/1N1k1N1p/1p6/3P2pK/2R1R3 w - - 0 1)

Levett, AJ

Ravenscroft, Frank

The Problemist, 1957

1bn3b1/5np1/r7/3P1pQ1/1N1k1N1p/1p6/3P2pK/2R1R3

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Sc6#
    • 1...Ra2
      • 2.Sc6#
    • 1...Ra3
      • 2.Sc6#
    • 1...Ra4
      • 2.Sc6#
    • 1...Ra5
      • 2.Sc6#
    • 1...Rc6
      • 2.Sxc6#
    • 1...Ra7
      • 2.Sc6#
    • 1...Ra8
      • 2.Sc6#
    • 1...Bxf4+
      • 2.Qxf4#
    • 1...Sfd6
      • 2.Qxg7#
    • 1...Sb6
      • 2.Sc6#
    • 1...Scd6
      • 2.Se6#
    • 1...g1Q+
      • 2.Qxg1#
    • 1...g1S
      • 2.Qxg1#
    • 1...g1B+
      • 2.Qxg1#
    • 1...g1R
      • 2.Qxg1#
  • Tries
    • 1.Qg3?
      • threat
        • 2.Qf2#
        • 2.Qc3#
        • 2.Qd3#
        • 2.Qe3#
      • 1...g1Q+
        • 2.Qxg1#
      • 1...g1B+
        • 2.Qxg1#
      • 1...Bxf4
        • 2.Qxf4#
      • 1...Rc6
        • 2.Sxc6#
        • 2.Qf2#
        • 2.Qd3#
        • 2.Qe3#
      • 1...Re6
        • 2.Sxe6#
        • 2.Qc3#
        • 2.Qd3#
      • 1...Se5
        • 2.Qf2#
        • 2.Qc3#
        • 2.Qe3#
      • 1...hxg3+!
  • Keys
    • 1.d3!
      • threat
        • 2.Rc4#
      • 1...Bxf4+
        • 2.Qxf4#
      • 1...g1Q+
        • 2.Qxg1#
      • 1...g1B+
        • 2.Qxg1#
      • 1...Rc6
        • 2.Sxc6#
      • 1...Se5
        • 2.Se2#
      • 1...Sfd6
        • 2.Qxg7#
      • 1...Sb6
        • 2.Sc6#
      • 1...Scd6
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • R(f);N_GUARD::S(E)
    • R(f);N_GUARD::S(E),XR(f)
    • B(i);CHECK,OGATE,XS(F)::QAR2(H),XB(i)
    • S(g);N_GUARD,N_PINS(F),S_CUTB(i),S_CUTR(f)::QAB(H),XP(h)
    • S(j);S_CUTR(f)::S(E)
    • S(j);N_PINS(F)::S(F)
    • P(a);CHECK,OGATE::QAB(H),XQ(a)
    • P(a);OGATE::QAB(H),XS(a)
    • P(a);CHECK,OGATE::QAB(H),XB(a)
    • P(a);OGATE::QAB(H),XR(a)
  • Tries
    • Try
      • Q(H);N_SPINS(F)
      • Threat
        • DUALS(4)
      • Vars
        • P(a);CHECK,OGATE::QAB(H),XQ(a)
        • P(a);CHECK,OGATE::QAB(H),XB(a)
        • B(i);OGATE,P_PINQ(H),XS(F)::QAR2(H),XB(i)
      • Refutation
        • P(d);CHECK,XQ(H)
  • Actual
    • P(C);
    • Threat
      • R1(A)
    • Vars
      • B(i);CHECK,OGATE,XS(F)::QAR2(H),XB(i)
      • P(a);CHECK,OGATE::QAB(H),XQ(a)
      • P(a);CHECK,OGATE::QAB(H),XB(a)
      • R(f);N_GUARD::S(E),XR(f)
      • S(g);N_PINS(F),SBLOCK::S(F)
      • S(g);N_GUARD,N_PINS(F),S_CUTB(i),S_CUTR(f)::QAB(H),XP(h)
      • S(j);S_CUTR(f)::S(E)
      • S(j);N_PINS(F)::S(F)
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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).