MESON Chess Problem Database

Problem Display
PID: 24879 (7K/b1Qb4/r4pB1/p1R2p2/P2k3N/N1R4n/8/2r1B1n1 w - - 0 1)

Callander, Charles

City of London Chess Magazine, 1874

7K/b1Qb4/r4pB1/p1R2p2/P2k3N/N1R4n/8/2r1B1n1

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Sf4
      • 2.Qxf4#
    • 1...f4
      • 2.Rd3#
  • Tries
    • 1.Sc2+?
      • 1...Ke4
        • 2.Re3#
      • 1...Rxc2!
    • 1.Sxf5+?
      • 1...Ke4
        • 2.Re3#
      • 1...Bxf5!
  • Keys
    • 1.Re5!
      • 1...Rxe1
        • 2.Sc2#
      • 1...Rxc3
        • 2.Qxc3#
      • 1...Bxa4
        • 2.Sxf5#
      • 1...fxe5
        • 2.Qc4#
      • 1...Rd6
        • 2.Qxd6#
      • 1...Ra1
        • 2.Sc2#
      • 1...Rb1
        • 2.Sc2#
      • 1...Rd1
        • 2.Sc2#
      • 1...Rc2
        • 2.Sxc2#
      • 1...Rb6
        • 2.Qc5#
      • 1...Rc6
        • 2.Sb5#
      • 1...Re6
        • 2.Sxf5#
      • 1...Bc5
        • 2.Qxc5#
      • 1...Bb6
        • 2.Qd6#
      • 1...Bb8
        • 2.Qc5#
      • 1...Bb5
        • 2.Sxb5#
        • 2.Sxf5#
      • 1...Bc6
        • 2.Sxf5#
      • 1...Be6
        • 2.Sb5#
      • 1...Bc8
        • 2.Sb5#
      • 1...Be8
        • 2.Sxf5#
      • 1...Se2
        • 2.Sf3#
      • 1...Sf3
        • 2.Sxf3#
      • 1...Sf2
        • 2.Bxf2#
      • 1...Sf4
        • 2.Bf2#
      • 1...Sg5
        • 2.Bf2#
      • 1...f4
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 23
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAR2(H),XS(c)
    • P(f);::R1(C)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(d);P-FLIGHT,P_SPINP(f)::R1(C)
      • Refutation
        • R(a);XS(B)
    • Try
      • S(E);CHECK,XP(f)
      • Vars
        • K(d);P-FLIGHT::R1(C)
      • Refutation
        • B(j);XS(E)
  • Actual
    • R(F);
    • Vars
      • R(a);N_GUARD,XB(A)::S(B)
      • R(a);OGATE,XR(C)::QAB1(H),XR(a)
      • B(j);N_GUARD,XP(D)::S(E),XP(f)
      • P(h);SBLOCK,XR(F)::QAR1(H)
      • R(g);N_GUARD::QAR2(H),XR(g)
      • R(a);N_GUARD::S(B)
      • R(a);N_GUARD::S(B),XR(a)
      • R(g);S_CUTB(i)::QAB1(H)
      • R(g);S_CUTB(j)::S(B)
      • R(g);S_CUTB(j)::S(E),XP(f)
      • B(i);N_GUARD::QAB1(H),XB(i)
      • B(i);S_CUTR(g)::QAR2(H)
      • B(i);N_GUARD::QAB1(H)
      • B(j);N_GUARD::S(E),XP(f)
      • B(j);N_GUARD::S(B)
      • S(b);N_GUARD::S(E)
      • S(b);N_GUARD::S(E),XS(b)
      • S(c);N_GUARD::B(A),XS(c)
      • S(c);N_GUARD::B(A)
      • P(f);::R1(C)
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