MESON Chess Problem Database

Problem Display
PID: 271608 (K2k2n1/R5B1/p1pN2pN/1PP5/6r1/pq2b2B/8/4R3 w - - 0 1)

Ager, GC

The Problemist, 1956

K2k2n1/R5B1/p1pN2pN/1PP5/6r1/pq2b2B/8/4R3

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Shf7#
    • 1...Qc2
      • 2.Shf7#
    • 1...Qa4
      • 2.Shf7#
    • 1...Qf7
      • 2.Shxf7#
    • 1...Qb1
      • 2.Shf7#
    • 1...Qb2
      • 2.Shf7#
    • 1...Qc3
      • 2.Shf7#
    • 1...Qd3
      • 2.Shf7#
    • 1...Qb4
      • 2.Shf7#
    • 1...Qxb5
      • 2.Shf7#
    • 1...Rg1
      • 2.Rd7#
    • 1...Rg2
      • 2.Rd7#
    • 1...Rg3
      • 2.Rd7#
    • 1...Ra4
      • 2.Rd7#
    • 1...Rb4
      • 2.Rd7#
    • 1...Rc4
      • 2.Shf7#
      • 2.Rd7#
    • 1...Rd4
      • 2.Rd7#
    • 1...Re4
      • 2.Rd7#
    • 1...Rf4
      • 2.Rd7#
    • 1...Rh4
      • 2.Rd7#
    • 1...Rg5
      • 2.Rd7#
    • 1...Bc1
      • 2.Re8#
    • 1...Bg1
      • 2.Re8#
    • 1...Bd2
      • 2.Re8#
    • 1...Bf2
      • 2.Re8#
    • 1...Bd4
      • 2.Re8#
    • 1...Bf4
      • 2.Re8#
    • 1...Bxc5
      • 2.Re8#
    • 1...Bg5
      • 2.Re8#
    • 1...Bxh6
      • 2.Re8#
    • 1...Sf6
      • 2.Bxf6#
    • 1...Sxh6
      • 2.Bf6#
  • Tries
    • 1.Bxg4?
      • threat
        • 2.Rd7#
      • 1...Qf7
        • 2.Shxf7#
      • 1...Sf6
        • 2.Bxf6#
      • 1...Qe6!
    • 1.Bf6+?
      • 1...Se7
        • 2.Bxe7#
      • 1...Sxf6!
  • Keys
    • 1.Bc3!
      • threat
        • 2.Ba5#
      • 1...Qxc3
        • 2.Shf7#
      • 1...Qxb5
        • 2.Shf7#
      • 1...Bxc5
        • 2.Re8#
      • 1...Qa4
        • 2.Shf7#
      • 1...Qf7
        • 2.Shxf7#
      • 1...Qb4
        • 2.Shf7#
      • 1...Ra4
        • 2.Rd7#
      • 1...Rb4
        • 2.Rd7#
      • 1...Bd2
        • 2.Re8#
      • 1...a5
        • 2.Bxa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 22
  • Sets
    • Q(b);N_GUARD::S(F)
    • Q(b);N_GUARD::S(F),XQ(b)
    • Q(b);N_GUARD,XP(C)::S(F)
    • R(d);::R1(G)
    • B(c);OGATE::R1(A)
    • B(c);OGATE,XP(D)::R1(A)
    • B(c);OGATE,XS(F)::R1(A)
    • S(i);N_GUARD::B(H),XS(i)
    • S(i);N_GUARD,XS(F)::B(H)
  • Tries
    • Try
      • B(B);XR(d)
      • Threat
        • R1(G)
      • Vars
        • Q(b);N_GUARD::S(F),XQ(b)
        • S(i);N_GUARD::B(H),XS(i)
      • Refutation
        • Q(b);
    • Try
      • B(H);CHECK
      • Vars
        • S(i);N_GUARD,P_SPINS(i)::B(H),XS(i)
      • Refutation
        • S(i);XB(H)
  • Actual
    • B(H);
    • Threat
      • B(H)
    • Vars
      • Q(b);N_GUARD,XB(H)::S(F)
      • Q(b);N_GUARD,XP(C)::S(F)
      • B(c);OGATE,XP(D)::R1(A)
      • Q(b);N_GUARD::S(F)
      • Q(b);N_GUARD::S(F),XQ(b)
      • R(d);::R1(G)
      • B(c);OGATE::R1(A)
      • P(e);::B(H),XP(e)
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