MESON Chess Problem Database

Problem Display
PID: 254574 (4Q1B1/3p4/1P3P2/1q1N1r2/Ppk3nR/1p1r1N2/1Kn5/6B1 w - - 0 1)

Reddmann, Hauke

Die Schwalbe, 2021

4Q1B1/3p4/1P3P2/1q1N1r2/Ppk3nR/1p1r1N2/1Kn5/6B1

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Se3#
    • 1...Qxd5
      • 2.Qc8#
    • 1...Qxb6
      • 2.Sxb6#
    • 1...Rdxd5
      • 2.Qe2#
    • 1...Rfxd5
      • 2.Se5#
    • 1...Re5
      • 2.Sxe5#
    • 1...Rxf6
      • 2.Se5#
    • 1...d6
      • 2.Qxb5#
  • Tries
    • 1.Sf4+?
      • 1...Qd5
        • 2.Qc8#
      • 1...Rdd5
        • 2.Sd2#
        • 2.Qe2#
      • 1...d5
        • 2.Qxb5#
      • 1...Rfd5!
    • 1.Sc7+?
      • 1...Rdd5
        • 2.Qe2#
      • 1...Rfd5
        • 2.Se5#
      • 1...d5
        • 2.Qxb5#
      • 1...Qd5!
    • 1.Se7+?
      • 1...Qd5
        • 2.Qc8#
      • 1...Rfd5
        • 2.Se5#
      • 1...d5
        • 2.Qxb5#
      • 1...Rdd5!
    • 1.Qc8+?
      • 1...Qc5
        • 2.Se3#
        • 2.Qxc5#
      • 1...Qc6!
  • Keys
    • 1.Sc3+!
      • 1...Qd5
        • 2.Qc8#
      • 1...Rdd5
        • 2.Qe2#
      • 1...Rfd5
        • 2.Se5#
      • 1...d5
        • 2.Qxb5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(g);SBLOCK::B(J)+S(F),DCHECK
    • Q(g);N_GUARD,P_SPINQ(g),XS(F)::QAR(I)
    • Q(g);XP(G)::B(J)+S(F),DCHECK,XQ(g)
    • R(c);OGATEB,P_SPINR(c),XS(F)::QAB(I)
    • R(h);N_GUARD,P_SPINR(h),XS(F)::S(C)
    • R(h);N_GUARD::S(C),XR(h)
    • R(h);N_GUARD,XP(H)::S(C)
    • P(i);OGATE::QAB1(I),XQ(g)
  • Tries
    • Try
      • S(F);CHECK,N_PINS(f)
      • Vars
        • Q(g);P_SPINQ(g)::QAR(I)
        • P(i);OGATE,P_SPINP(i)::QAB1(I),XQ(g)
      • Refutation
        • R(h);P_SPINR(h)
    • Try
      • S(F);CHECK
      • Vars
        • R(c);P_SPINR(c),S_CUTP(i),S_CUTQ(g),S_CUTR(h)::QAB(I)
        • R(h);P_SPINR(h)::S(C)
        • P(i);OGATE,P_SPINP(i)::QAB1(I),XQ(g)
      • Refutation
        • Q(g);P_SPINQ(g)
    • Try
      • S(F);CHECK
      • Vars
        • Q(g);P_SPINQ(g)::QAR(I)
        • R(h);P_SPINR(h)::S(C)
        • P(i);OGATE,P_SPINP(i)::QAB1(I),XQ(g)
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • Q(I);CHECK
      • Refutation
        • Q(g);P_SPINQ(g)
  • Actual
    • S(F);CHECK
    • Vars
      • Q(g);P_SPINQ(g)::QAR(I)
      • R(c);P_SPINR(c),S_CUTP(i),S_CUTQ(g),S_CUTR(h)::QAB(I)
      • R(h);P_SPINR(h)::S(C)
      • P(i);OGATE,P_SPINP(i)::QAB1(I),XQ(g)
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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).