MESON Chess Problem Database

Problem Display
PID: 45186 (8/K1N5/QR6/4Bk1P/p2r1Pp1/5r2/4P3/7B w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

8/K1N5/QR6/4Bk1P/p2r1Pp1/5r2/4P3/7B

#2

9 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Rf1
      • 2.Rf6#
    • 1...Rf2
      • 2.Rf6#
    • 1...Ra3
      • 2.Rf6#
    • 1...Rb3
      • 2.Rf6#
    • 1...Rc3
      • 2.Rf6#
    • 1...Rfd3
      • 2.Rf6#
    • 1...Re3
      • 2.Rf6#
    • 1...Rg3
      • 2.Rf6#
    • 1...Rh3
      • 2.Rf6#
    • 1...Re4
      • 2.Rf6#
      • 2.Qc8#
  • Tries
    • 1.Qd3+?
      • 1...Rfxd3
        • 2.Rf6#
      • 1...Re4
        • 2.Rf6#
        • 2.Qd7#
      • 1...Rdxd3!
    • 1.e4+?
      • 1...Rxe4
        • 2.Rf6#
        • 2.Qc8#
      • 1...Kxe4!
  • Keys
    • 1.Rb4!
      • threat
        • 2.Qg6#
      • 1...Ke4
        • 2.Qd3#
      • 1...Rfxf4
        • 2.Qf6#
      • 1...Rdxf4
        • 2.Qf6#
      • 1...Rd6
        • 2.e4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • R(a);::R1(G)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • R(a);XQ(F)::R1(G)
      • Refutation
        • R(c);XQ(F)
    • Try
      • P(B);CHECK
      • Refutation
        • K(e);P_SPINR(a),S_FLIGHT,XP(B)
  • Actual
    • R(G);
    • Threat
      • QAB1(F)
    • Vars
      • K(e);P_SPINR(a),S_FLIGHT::QAB1(F)
      • R(a);XP(C)::QAR1(F)
      • R(c);XP(C)::QAR1(F)
      • R(c);N_GUARD::P(B)
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Developed and maintained by Brian Stephenson.
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