MESON Chess Problem Database

Problem Display
PID: 109912 (B1Q5/5rP1/p7/q2N3K/p5RR/r4k2/3Pp3/1N2Bb1n w - - 0 1)

Schead, Demetrio

Caissa, 1980

B1Q5/5rP1/p7/q2N3K/p5RR/r4k2/3Pp3/1N2Bb1n

#2

10 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd2
      • 2.Sxd2#
    • 1...Qc7
      • 2.Sxc7#
    • 1...Qxd5+
      • 2.Bxd5#
    • 1...Rf5+
      • 2.Qxf5#
    • 1...Ra7
      • 2.Qf5#
    • 1...Rb7
      • 2.Qf5#
    • 1...Rc7
      • 2.Qf5#
    • 1...Re7
      • 2.Qf5#
    • 1...Rxg7
      • 2.Qf5#
    • 1...Rf8
      • 2.Qxf8#
      • 2.gxf8Q#
      • 2.gxf8R#
    • 1...Sg3+
      • 2.Rxg3#
  • Tries
    • 1.Rh3+?
      • 1...Sg3+
        • 2.Rhxg3#
      • 1...Bxh3!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Qxf7#
      • 1...Qxd5+
        • 2.Bxd5#
      • 1...Rf5+
        • 2.Qxf5#
      • 1...Sg3+
        • 2.Rxg3#
      • 1...Qxd2
        • 2.Sxd2#
      • 1...Rxf8
        • 2.gxf8Q#
        • 2.gxf8R#
      • 1...Rf4
        • 2.Qxf4#
      • 1...Qb4
        • 2.Sxb4#
      • 1...Qc3
        • 2.Sdxc3#
      • 1...Qb6
        • 2.Sxb6#
      • 1...Qc7
        • 2.Sxc7#
      • 1...Qd8
        • 2.Qxa3#
      • 1...Rf6
        • 2.Qxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 5
  • Sets
    • Q(g);N_PINS(F),XP(C)::S(A),XQ(g)
    • Q(g);N_PINS(F)::B(I)+S(F),XQ(g)
    • Q(g);CHECK,OGATE,P_SPINQ(g),XS(F)::B(I),XQ(g)
    • R(i);CHECK,N_GUARD,N_PINS(F)::QAR2(J),XR(i)
    • R(i);N_GUARD::QAR2(J)
    • R(i);N_GUARD,XP(H)::QAR2(J)
    • S(b);CHECK,N_GUARD::R1(D),XS(b)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • S(b);CHECK,N_GUARD,P_SPINS(b)::R1(E),XS(b)
      • Refutation
        • B(a);XR(E)
  • Actual
    • Q(J);P_PINR(i)
    • Threat
      • QAR(J),XR(i)
    • Vars
      • Q(g);CHECK,OGATE,P_SPINQ(g),XS(F)::B(I),XQ(g)
      • R(i);CHECK,N_PINS(F),OGATE::QAR2(J),XR(i)
      • S(b);CHECK,N_GUARD::R1(D),XS(b)
      • Q(g);N_PINS(F),XP(C)::S(A),XQ(g)
      • R(i);N_SPINR(i),OGATE,XQ(J)::PXR(i)=Q
      • R(i);OGATE::QAR1(J),XR(i)
      • Q(g);N_PINS(F)::B(I)+S(F),XQ(g)
      • Q(g);N_GUARD,N_PINS(F)::QAR(J),XR(d)
      • R(i);OGATE::QAR(J),XR(i)
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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).