MESON Chess Problem Database

Problem Display
PID: 214944 (5n2/8/1K5p/1p2pQpR/3kp1pR/8/1N1P1P2/8 w - - 0 1)

Anonymous

SEPA, 1942

5n2/8/1K5p/1p2pQpR/3kp1pR/8/1N1P1P2/8

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sg6
      • 2.Qd7#
    • 1...Sd7+
      • 2.Qxd7#
    • 1...Sh7
      • 2.Qd7#
    • 1...e3
      • 2.Qd3#
    • 1...g3
      • 2.Qxe4#
    • 1...gxh4
      • 2.Qxe5#
  • Tries
    • 1.Rxg4?
      • threat
        • 2.Qxe4#
      • 1...Sd7+
        • 2.Qxd7#
      • 1...Kd5!
    • 1.Rxg5?
      • threat
        • 2.Qxe5#
      • 1...Sd7+
        • 2.Qxd7#
      • 1...Kd5
        • 2.Qxe5#
      • 1...Sg6
        • 2.Qd7#
      • 1...hxg5!
    • 1.f3?
      • threat
        • 2.Qxe4#
      • 1...Sd7+
        • 2.Qxd7#
      • 1...exf3
        • 2.Qd3#
      • 1...e3
        • 2.Qd3#
        • 2.Qe4#
      • 1...Kd5!
  • Keys
    • 1.f4!
      • threat
        • 2.Qxe5#
      • 1...Sd7+
        • 2.Qxd7#
      • 1...Kd5
        • 2.Qxe5#
      • 1...exf4
        • 2.Qc5#
      • 1...exf4 ep
        • 2.Qd3#
      • 1...gxf4 ep
        • 2.Qxe4#
      • 1...Sg6
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • S(h);N_GUARD::QAR(E)
    • S(h);CHECK,N_GUARD::QAR(E),XS(h)
    • P(b);OGATE,P_SPINP(c)::QAR1(E)
    • P(c);P_SPINP(b)::QAR1(E),XP(b)
    • P(f);XR(D)::QAB1(E),XP(e)
  • Tries
    • Try
      • R(D);P_PINP(b),XP(c)
      • Threat
        • QAR1(E),XP(b)
      • Vars
        • S(h);CHECK,N_GUARD::QAR(E),XS(h)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT,P_SPINP(e)
    • Try
      • R(F);XP(f)
      • Threat
        • QAB1(E),XP(e)
      • Vars
        • S(h);CHECK,N_GUARD::QAR(E),XS(h)
        • K(a);P-FLIGHT,P_SPINP(e)::QAR1(E),XP(e)
        • S(h);N_GUARD::QAR(E)
      • Refutation
        • P(g);XR(F)
    • Try
      • P(C);
      • Threat
        • QAR1(E),XP(b)
      • Vars
        • S(h);CHECK,N_GUARD::QAR(E),XS(h)
        • P(b);OGATE,P_SPINP(c),XP(C)::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(e)
  • Actual
    • P(C);
    • Threat
      • QAB1(E),XP(e)
    • Vars
      • S(h);CHECK,N_GUARD::QAR(E),XS(h)
      • K(a);P-FLIGHT,P_SPINP(e)::QAR1(E),XP(e)
      • P(e);OGATE,XP(C)::QAB1(E)
      • P(b);EP,OGATE,P_SPINP(c),XP(C)::QAR1(E)
      • P(c);EP,P_SPINP(b),XP(C)::QAR1(E),XP(b)
      • S(h);N_GUARD::QAR(E)
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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).