MESON Chess Problem Database

Problem Display
PID: 138906 (2K2b2/QN5p/3P3r/PR4p1/3pkrnR/1p1p3B/qP1p2PB/3N4 w - - 0 1)

Saarenheimo, Eero Johannes

The Problemist, 1936

2K2b2/QN5p/3P3r/PR4p1/3pkrnR/1p1p3B/qP1p2PB/3N4

#2

12 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Rf1
      • 2.Re5#
    • 1...Rf2
      • 2.Re5#
    • 1...Rf3
      • 2.Re5#
    • 1...Rff6
      • 2.Re5#
    • 1...Rf7
      • 2.Re5#
    • 1...Sf2
      • 2.Bf5#
    • 1...Sxh2
      • 2.Bf5#
    • 1...Se3
      • 2.Sf2#
    • 1...Sf6
      • 2.Bf5#
  • Tries
    • 1.Qc5?
      • threat
        • 2.Qd5#
        • 2.Qc6#
      • 1...Rf5
        • 2.Qxf5#
      • 1...Se3
        • 2.Sf2#
        • 2.Qe5#
      • 1...Se5
        • 2.Qd5#
        • 2.Qxe5#
      • 1...Sf6
        • 2.Bf5#
        • 2.Qe5#
        • 2.Qf5#
      • 1...Rxd6!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Sd8#
      • 1...Qxa5
        • 2.Sxa5#
      • 1...Rxd6
        • 2.Sxd6#
      • 1...Rf5
        • 2.Sc5#
      • 1...Rf7
        • 2.Re5#
      • 1...Se3
        • 2.Sf2#
      • 1...Se5
        • 2.Sc5#
      • 1...Sf6
        • 2.Bf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • R(g);P_SPINS(h)::R1(H)
    • S(h);OGATE,P_SPINR(g)::B(E)
    • S(h);OGATE,P_SPINR(g),XB(D)::B(E)
    • S(h);N_GUARD,P_SPINR(g),SBLOCK::S(A)
  • Tries
    • Try
      • Q(J);
      • Threat
        • DUALS(2)
      • Vars
        • R(g);N_GUARD,P_SPINS(h)::QAB1(J),XR(g)
      • Refutation
        • R(j);XP(I)
  • Actual
    • Q(J);
    • Threat
      • QAB(J)+S(K)
    • Vars
      • Q(a);XP(G)::QAB(J)+S(K),XQ(a)
      • R(j);XP(I)::QAB(J)+S(K),DCHECK,XR(j)
      • R(g);P_SPINS(h),SBLOCK::QAB(J)+S(K),DCHECK
      • R(g);P_SPINS(h)::R1(H)
      • S(h);N_GUARD,P_SPINR(g),SBLOCK::S(A)
      • S(h);P_SPINR(g),SBLOCK::QAB(J)+S(K),DCHECK
      • S(h);OGATE,P_SPINR(g)::B(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).