MESON Chess Problem Database

Problem Display
PID: 256816 (1rn5/B2p3b/1r1Q3K/3B1RNp/2Nk1n1R/2pp4/3P4/2b2q2 w - - 0 1)

Castro e Melo, Jose

Probleemblad, 1947

1rn5/B2p3b/1r1Q3K/3B1RNp/2Nk1n1R/2pp4/3P4/2b2q2

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qh3
      • 2.Rhxf4#
    • 1...Qd1
      • 2.Rhxf4#
    • 1...Qe1
      • 2.Sf3#
    • 1...Qg1
      • 2.Sf3#
      • 2.Rhxf4#
    • 1...Qf3
      • 2.Sxf3#
  • Tries
    • 1.Rfxf4+?
      • 1...Be4
        • 2.Rxe4#
      • 1...Qxf4!
  • Keys
    • 1.Se4!
      • threat
        • 2.Qf6#
        • 2.dxc3#
      • 1...Bxd2
        • 2.Qf6#
      • 1...Bxf5
        • 2.dxc3#
      • 1...Sxd5
        • 2.Sf2#
      • 1...Sxd6
        • 2.dxc3#
      • 1...Sxa7
        • 2.dxc3#
      • 1...cxd2
        • 2.Qf6#
      • 1...Qe1
        • 2.Qf6#
      • 1...Bb2
        • 2.Qf6#
      • 1...Se2
        • 2.Qf6#
      • 1...Sg2
        • 2.Qf6#
      • 1...Sh3
        • 2.Qf6#
      • 1...Se6
        • 2.Qe5#
      • 1...Sg6
        • 2.Qc5#
      • 1...c2
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 13
    • REMOVED MATES = 3
  • Sets
    • Q(b);N_GUARD::R(C),XS(f)
    • Q(b);N_GUARD::S(F)
    • Q(b);N_GUARD::S(F),XQ(b)
  • Tries
    • Try
      • R(E);CHECK,XS(f)
      • Vars
        • B(j);N_GUARD,P_SPINB(j)::R1(E),XB(j)
      • Refutation
        • Q(b);P_PINS(F),P_SPINQ(b),XR(E)
  • Actual
    • S(F);N_PINS(f)
    • Threat
      • DUALS(2)
    • Vars
      • B(a);XP(A)::QAB(G)
      • B(j);XR(E)::P(A),XP(c)
      • S(f);P_PINP(A),P_SPINS(f),XB(D)::R(C)+S(F)
      • S(l);XQ(G)::P(A),XP(c)
      • S(l);N_SPINR(h),XB(I)::P(A),XP(c)
      • P(c);XP(A)::QAB(G)
      • Q(b);::QAB(G)
      • B(a);::QAB(G)
      • S(f);P_PINP(A)::QAB(G)
      • S(f);N_PINQ(G),P_PINP(A)::QAB1(G)
      • P(c);::QAB(G)
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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).