MESON Chess Problem Database

Problem Display
PID: 222600 (4Kn2/7n/1R2bkpP/7p/4BP2/3p2QN/2P2r2/8 w - - 0 1)

Hirsebrei, E

New Orleans Times-Democrat, 1884

4Kn2/7n/1R2bkpP/7p/4BP2/3p2QN/2P2r2/8

#2

8 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf4
      • 2.Qxf4#
    • 1...Sg5
      • 2.Qxg5#
      • 2.fxg5#
    • 1...Sd7
      • 2.Qxg6#
    • 1...dxc2
      • 2.Qc3#
    • 1...d2
      • 2.Qc3#
  • Tries
    • 1.Sxf2?
      • 1...dxc2
        • 2.Qc3#
      • 1...Sg5
        • 2.Qxg5#
        • 2.fxg5#
      • 1...Sd7
        • 2.Qxg6#
      • 1...d2
        • 2.Qc3#
      • 1...h4
        • 2.Sg4#
      • 1...g5!
    • 1.Rxe6+?
      • 1...Sxe6
        • 2.Qxg6#
      • 1...Kxe6!
    • 1.Qh4+?
      • 1...Sg5
        • 2.Qxg5#
      • 1...g5!
  • Keys
    • 1.Qg1!
      • threat
        • 2.Qa1#
      • 1...Rxc2
        • 2.Qd4#
      • 1...Rf1
        • 2.Qd4#
      • 1...Sd7
        • 2.Qxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • R(a);OGATE,XP(E)::QAR2(B),XR(a)
    • S(h);N_GUARD::QAR1(B),XP(f)
    • P(b);OGATE,XP(A)::QAB(B)
    • P(b);OGATE::QAB(B)
  • Tries
    • Try
      • S(C);XR(a)
      • Vars
        • P(b);OGATE,XP(A)::QAB(B)
        • S(h);N_GUARD::QAR1(B),XP(f)
        • P(b);OGATE::QAB(B)
        • P(c);N_GUARD::S(C)
      • Refutation
        • P(f);
    • Try
      • R(F);CHECK,XB(d)
      • Vars
        • S(h);SBLOCK,XR(F)::QAR1(B),XP(f)
      • Refutation
        • K(e);P-FLIGHT,XR(F)
    • Try
      • Q(B);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAB1(B),XS(g)
      • Refutation
        • P(f);P_SPINP(f)
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • R(a);OGATE,XP(A)::QAB(B)
      • R(a);OGATE::QAB(B)
      • S(h);N_GUARD::QAR1(B),XP(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).