MESON Chess Problem Database

Problem Display
PID: 141675 (r4q1N/1pR2pPn/pP1k2bR/3pr3/2pN4/3n1QB1/8/5K2 w - - 0 1)

Dyachuk, Vasyl Vasilovich

1st Prize, PCCC-50 JT, 2010

r4q1N/1pR2pPn/pP1k2bR/3pr3/2pN4/3n1QB1/8/5K2

#2

9 + 12

145 StrateGems 2011
23 Die Schwalbe 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qb8
      • 2.Sxf7#
    • 1...Qc8
      • 2.Sxf7#
    • 1...Qd8
      • 2.Sxf7#
    • 1...Sc1
      • 2.Qa3#
    • 1...Se1
      • 2.Qa3#
    • 1...Sb2
      • 2.Qa3#
    • 1...Sf2
      • 2.Qa3#
    • 1...Sf4
      • 2.Qa3#
    • 1...Sf6
      • 2.Qxf6#
  • Tries
    • 1.Bxe5+?
      • 1...Sxe5
        • 2.Qa3#
      • 1...Kxe5!
    • 1.gxf8Q+?
      • 1...Sxf8
        • 2.Sxf7#
      • 1...Rxf8!
    • 1.gxf8B+?
      • 1...Sxf8
        • 2.Sxf7#
      • 1...Rxf8!
  • Keys
    • 1.Qxf7!
      • threat
        • 2.Sf5#
      • 1...Qxf7+
        • 2.Sxf7#
      • 1...Qc8
        • 2.Qe7#
      • 1...Sf4
        • 2.Qd7#
      • 1...Sf6
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(l);N_GUARD::S(I),XP(i)
    • S(a);OGATE::QAB(B)
    • S(a);N_SPINR(d),OGATE::QAB(B)
    • S(j);N_GUARD,N_SPINB(g)::QAR2(B),XS(j)
  • Tries
    • Try
      • B(C);CHECK,XR(d)
      • Vars
        • S(a);OGATE,SBLOCK,XB(C)::QAB(B)
      • Refutation
        • K(f);N_SPINB(g),S_FLIGHT,XB(C)
    • Try
      • P(H);CHECK,XQ(l)
      • Vars
        • S(j);XQ(H)::S(I),XP(i)
      • Refutation
        • R(k);XQ(H)
    • Try
      • P(H);CHECK,XQ(l)
      • Vars
        • S(j);XB(H)::S(I),XP(i)
      • Refutation
        • R(k);XB(H)
  • Actual
    • Q(B);P_SPINQ(B),XP(i)
    • Threat
      • S(D)
    • Vars
      • Q(l);CHECK,XQ(B)::S(I),XQ(l)
      • Q(l);N_PINQ(B)::QAB1(B)
      • S(a);N_PINQ(B),N_SPINR(d)::QAR1(B)
      • S(j);N_PINQ(B),N_SPINB(g)::QAR1(B)
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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).