MESON Chess Problem Database

Problem Display
PID: 276887 (5r2/3p2B1/3KP3/4R3/2N1B1Q1/8/p3P1pb/k2N2R1 w - - 0 1)

Haring, Jacobus

Stella Polaris, 1971

5r2/3p2B1/3KP3/4R3/2N1B1Q1/8/p3P1pb/k2N2R1

#2

10 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Rf5#
    • 1...Bg3
      • 2.Sf2#
    • 1...Bf4
      • 2.Sde3#
    • 1...Bxe5+
      • 2.Bxe5#
  • Tries
    • 1.Qg3?
      • threat
        • 2.Qc3#
      • 1...Bxg3
        • 2.Sf2#
      • 1...Rb8
        • 2.Rb5#
      • 1...Rf3!
    • 1.Qg5?
      • threat
        • 2.Qc1#
      • 1...Bxe5+
        • 2.Bxe5#
        • 2.Qxe5#
      • 1...Rf4
        • 2.Rf5#
      • 1...Bf4
        • 2.Sde3#
      • 1...Rb8!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qc1#
      • 1...Rxf4
        • 2.Rf5#
      • 1...Bxf4
        • 2.Sde3#
      • 1...Rb8
        • 2.Rb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(f);N_PINR(G)::B(J)+R(G)
    • B(d);N_GUARD::R(B)+S(A)
    • B(d);N_GUARD,S_CUTR(f)::R(B)+S(A)
    • B(d);CHECK,OGATE,P_SPINB(d),XR(G)::B(J),XB(d)
  • Tries
    • Try
      • Q(F);N_SPINR(G)
      • Threat
        • QAB(F)
      • Vars
        • B(d);N_GUARD,P_PINR(G),XQ(F)::R(B)+S(A)
        • R(f);N_GUARD::B(J)+R(G)
      • Refutation
        • R(f);
    • Try
      • Q(F);
      • Threat
        • QAR2(F)
      • Vars
        • R(f);N_PINR(G)::B(J)+R(G)
        • B(d);N_GUARD,S_CUTR(f)::R(B)+S(A)
      • Refutation
        • R(f);
  • Actual
    • Q(F);N_SPINR(G)
    • Threat
      • QAR2(F)
    • Vars
      • R(f);N_GUARD,XQ(F)::B(J)+R(G)
      • B(d);N_GUARD,P_PINR(G),XQ(F)::R(B)+S(A)
      • R(f);N_GUARD::B(J)+R(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).