MESON Chess Problem Database

Problem Display
PID: 268344 (1R2NbK1/p2r2p1/bnp5/pkN2Q2/pqnPP3/8/6r1/1R3B2 w - - 0 1)

Masek, Zdenek

4th Comm., KeyStip 27B. Ty., 1981

1R2NbK1/p2r2p1/bnp5/pkN2Q2/pqnPP3/8/6r1/1R3B2

#2

9 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd4
      • 2.Sc7#
    • 1...Rd5
      • 2.Sc7#
    • 1...Rd6
      • 2.Sc7#
    • 1...Rc7
      • 2.Sxc7#
    • 1...Re7
      • 2.Sd6#
    • 1...Rd8
      • 2.Sc7#
    • 1...Bxc5
      • 2.Qxc5#
  • Tries
    • 1.Sb3+?
      • 1...Qc5
        • 2.Sd2#
      • 1...Rd5
        • 2.Sc7#
      • 1...c5
        • 2.Qxd7#
      • 1...Bc5!
    • 1.Sxa4+?
      • 1...Rd5
        • 2.Sc3#
      • 1...Bc5
        • 2.Sc3#
      • 1...c5
        • 2.Qxd7#
      • 1...Kxa4!
    • 1.Se6+?
      • 1...Rd5
        • 2.S6c7#
        • 2.S8c7#
      • 1...Bc5
        • 2.Qxc5#
      • 1...c5!
    • 1.Sb7+?
      • 1...Rd5
        • 2.Sc7#
      • 1...Bc5
        • 2.Qxc5#
      • 1...Sd5
        • 2.Sbd6#
      • 1...c5!
    • 1.Sxd7+?
      • 1...Bc5
        • 2.Sd6#
        • 2.Sc7#
        • 2.Qxc5#
      • 1...c5!
  • Keys
    • 1.Sd3+!
      • 1...Rd5
        • 2.Sc7#
      • 1...Bc5
        • 2.Qxc5#
      • 1...Se5
        • 2.Sf2#
      • 1...c5
        • 2.Qxd7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(k);N_GUARD,XP(C)::S(H)
    • R(k);N_GUARD::S(H)
    • R(k);N_GUARD::S(H),XR(k)
    • R(k);N_GUARD,S_CUTB(m)::S(H)
    • B(m);OGATE,P_SPINB(m),XS(E)::QAR1(F),XB(m)
  • Tries
    • Try
      • S(E);CHECK,N_PINQ(c)
      • Vars
        • Q(c);P_SPINQ(c),S_CUTB(m),S_CUTP(i),S_CUTR(k)::R(A)+S(E)
        • R(k);P_SPINR(k)::S(H)
        • P(i);OGATEB,P_SPINP(i)::QAB(F),XR(k)
      • Refutation
        • B(m);P_SPINB(m)
    • Try
      • S(E);CHECK,XP(b)
      • Vars
        • R(k);P_SPINR(k)::S(E)
        • B(m);P_SPINB(m)::S(E)
        • P(i);OGATEB,P_SPINP(i)::QAB(F),XR(k)
      • Refutation
        • K(f);N_SPINQ(c),N_SPINS(d),S_FLIGHT,XS(E)
    • Try
      • S(E);CHECK
      • Vars
        • B(m);N_GUARD,P_SPINB(m)::QAR1(F),XB(m)
      • Refutation
        • P(i);P_SPINP(i)
    • Try
      • S(E);CHECK
      • Vars
        • R(k);P_SPINR(k)::S(H)
        • B(m);N_GUARD,P_SPINB(m)::QAR1(F),XB(m)
        • S(h);::R(G)+S(E),DCHECK
      • Refutation
        • P(i);P_SPINP(i)
    • Try
      • S(E);CHECK,XR(k)
      • Refutation
        • P(i);P_SPINP(i)
  • Actual
    • S(E);CHECK,N_PINS(d),P_PINS(h)
    • Vars
      • R(k);P_SPINR(k)::S(H)
      • B(m);N_GUARD,P_SPINB(m)::QAR1(F),XB(m)
      • S(d);N_SPINS(h),P_SPINS(d),S_CUTB(m),S_CUTP(i),S_CUTR(k)::B(B)+S(E)
      • P(i);OGATEB,P_SPINP(i)::QAB(F),XR(k)
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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).