MESON Chess Problem Database

Problem Display
PID: 207544 (K3B3/2N1R3/2Q3q1/4n3/3P1p2/Pp1k1Pb1/Rn1rNP2/B4b2 w - - 0 1)

Collins, Francis Charles

Amateur Chess Magazine, 1872

K3B3/2N1R3/2Q3q1/4n3/3P1p2/Pp1k1Pb1/Rn1rNP2/B4b2

#2

12 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Sc1#
    • 1...Sa4
      • 2.Sc1#
    • 1...Sbc4
      • 2.Sc1#
    • 1...Sxf3
      • 2.Bxg6#
      • 2.Qc3#
    • 1...Sec4
      • 2.Bxg6#
      • 2.Qxg6#
    • 1...Sg4
      • 2.Bxg6#
      • 2.Qc3#
    • 1...Sd7
      • 2.Bxg6#
      • 2.Qc3#
    • 1...Sf7
      • 2.Qc3#
  • Tries
    • 1.Bxg6+?
      • 1...Sxg6
        • 2.Qc3#
      • 1...Kxe2!
    • 1.Qe4+?
      • 1...Kc4
        • 2.Bb5#
      • 1...Qxe4+!
    • 1.Qb5+?
      • 1...Sbc4
        • 2.Sc1#
      • 1...Sec4
        • 2.Bxg6#
        • 2.Qxb3#
      • 1...Kc2!
  • Keys
    • 1.Qc4+!
      • 1...Kxc4
        • 2.Bb5#
      • 1...Sbxc4
        • 2.Sc1#
      • 1...Sexc4
        • 2.Bxg6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • S(b);::S(C)
    • S(h);::QAR1(H)
  • Tries
    • Try
      • B(L);CHECK,XQ(i)
      • Vars
        • S(h);XB(L)::QAR1(H)
      • Refutation
        • K(e);P_SPINS(h),S_FLIGHT,XS(C)
    • Try
      • Q(H);CHECK
      • Vars
        • K(e);S_FLIGHT::B(L)
      • Refutation
        • Q(i);CHECK,XQ(H)
    • Try
      • Q(H);CHECK
      • Vars
        • S(b);P_SPINS(b)::S(C)
      • Refutation
        • K(e);P_SPINS(b),S_FLIGHT
  • Actual
    • Q(H);CHECK
    • Vars
      • K(e);S_FLIGHT,XQ(H)::B(L)
      • S(b);SBLOCK,XQ(H)::S(C)
      • S(h);SBLOCK,XQ(H)::B(L),XQ(i)
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