MESON Chess Problem Database

Problem Display
PID: 145562 (8/Q6p/2P2R1P/3pk3/4PN2/6p1/5nK1/4R3 w - - 0 1)

St Maurice, Charles-Ephrem

1st Prize, Canadian Chess Association, 1899

8/Q6p/2P2R1P/3pk3/4PN2/6p1/5nK1/4R3

#2

8 + 5

15 British Chess Magazine 1899
797 Bulletin de la FFE 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf6
      • 2.Qg7#
    • 1...dxe4
      • 2.Qa1#
    • 1...d4
      • 2.Qe7#
  • Tries
    • 1.Se2?
      • threat
        • 2.Qd4#
        • 2.Qe7#
      • 1...Kxe4
        • 2.Sc1#
        • 2.Sf4#
        • 2.Qd4#
      • 1...dxe4
        • 2.Qd4#
      • 1...d4
        • 2.Qxd4#
        • 2.Qe7#
      • 1...Kxf6!
    • 1.Qc7+?
      • 1...Kxf6
        • 2.Qg7#
      • 1...Kd4!
    • 1.exd5+?
      • 1...Se4
        • 2.Qa1#
      • 1...Kxf6!
  • Keys
    • 1.Rf1!
      • 1...Kxe4
        • 2.Re1#
      • 1...Kxf6
        • 2.Qg7#
      • 1...Sxe4
        • 2.Sd3#
      • 1...dxe4
        • 2.Qa1#
      • 1...Sd1
        • 2.Re6#
      • 1...Sh1
        • 2.Re6#
      • 1...Sd3
        • 2.Re6#
      • 1...Sh3
        • 2.Re6#
      • 1...Sg4
        • 2.Re6#
      • 1...d4
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • K(d);OGATEB,S_FLIGHT,XR(F)::QAB1(H)
    • P(c);N_GUARD,P_SPINP(c),XP(C)::QAB(H)
    • P(c);SBLOCK::QAR2(H)
  • Tries
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);XP(C)::QAB1(H)
      • Refutation
        • K(d);S_FLIGHT,XR(F)
    • Try
      • Q(H);CHECK
      • Vars
        • K(d);OGATEB,S_FLIGHT,XR(F)::QAB1(H)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • P(C);CHECK,XP(c)
      • Vars
        • S(a);P_SPINS(a)::QAB(H)
      • Refutation
        • K(d);S_FLIGHT,XR(F)
  • Actual
    • R(A);
    • Vars
      • K(d);OGATEB,P-FLIGHT,XP(C)::R(A)
      • K(d);OGATEB,S_FLIGHT,XR(F)::QAB1(H)
      • S(a);N_GUARD,SBLOCK,XP(C)::S(D)
      • P(c);N_GUARD,SBLOCK,XP(C)::QAB(H)
      • S(a);::R1(F)
      • P(c);SBLOCK::QAR2(H)
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