MESON Chess Problem Database

Problem Display
PID: 22760 (3r4/q3r3/1b6/2n2Rp1/2P2N2/QP2k1P1/4P3/BN2RnKB w - - 0 1)

White, Alain Campbell

Morning Post, 1906

3r4/q3r3/1b6/2n2Rp1/2P2N2/QP2k1P1/4P3/BN2RnKB

#2

12 + 8

4374 Les Tours de Force sur l'Echiquier 1906
16 Chess Amateur (The) 1908
56 The Problemist 1937
56 The Problemist 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Sg2#
    • 1...Rd3
      • 2.exd3#
    • 1...Rd5
      • 2.Sxd5#
    • 1...Ra8
      • 2.Sd5#
    • 1...Rb8
      • 2.Sd5#
    • 1...Rc8
      • 2.Sd5#
    • 1...Re8
      • 2.Sd5#
    • 1...Rf8
      • 2.Sd5#
    • 1...Rg8
      • 2.Sd5#
    • 1...Rh8
      • 2.Sd5#
    • 1...Sd3
      • 2.exd3#
    • 1...Se4
      • 2.Sg2#
    • 1...Se6
      • 2.Re5#
    • 1...Sb7
      • 2.Qxe7#
    • 1...Sd7
      • 2.Sd5#
  • Tries
    • 1.Re5+?
      • 1...Se4
        • 2.Sg2#
      • 1...Rxe5!
    • 1.Qc1+?
      • 1...Rd2
        • 2.Sd5#
      • 1...Sd2!
    • 1.Qxc5+?
      • 1...Rd4
        • 2.Sd5#
        • 2.Bxd4#
      • 1...Bxc5!
  • Keys
    • 1.Rd5!
      • threat
        • 2.Bd4#
      • 1...Rxd5
        • 2.Sxd5#
      • 1...Sxg3
        • 2.Qc1#
      • 1...Sxb3
        • 2.Qxb3#
      • 1...Re4
        • 2.Sg2#
      • 1...Sd3
        • 2.exd3#
      • 1...Sa4
        • 2.bxa4#
      • 1...Se4
        • 2.Sg2#
      • 1...Sa6
        • 2.b4#
      • 1...Se6
        • 2.Re5#
      • 1...Sb7
        • 2.Qxe7#
      • 1...Sd7
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • R(g);SBLOCK::S(K)
    • R(h);OGATE::R(C)+P(F),XR(h)
    • R(h);N_GUARD::S(K),XR(h)
    • R(h);N_GUARD::S(K)
    • S(c);OGATE::R(C)+P(F),XS(c)
    • S(c);SBLOCK::S(K)
    • S(c);N_GUARD,S_CUTR(g)::R(L)
    • S(c);OGATE::QAR(G),XR(g)
    • S(c);S_CUTR(h)::S(K)
  • Tries
    • Try
      • R(L);CHECK
      • Vars
        • S(c);P_SPINS(c)::S(K)
      • Refutation
        • R(g);XR(L)
    • Try
      • Q(G);CHECK
      • Vars
        • R(h);P_SPINR(h)::S(K)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(G);CHECK,XS(c)
      • Refutation
        • B(e);XQ(G)
  • Actual
    • R(L);
    • Threat
      • B(A)
    • Vars
      • R(h);XR(L)::S(K),XR(h)
      • S(a);N_GUARD,XP(I)::QAB(G)
      • S(c);OGATE,P_SPINS(c),XP(H)::QAR(G),XS(c)
      • R(g);SBLOCK::S(K)
      • S(c);OGATE::R(C)+P(F),XS(c)
      • S(c);OGATE::QAR(G)+P(H),XS(c)
      • S(c);SBLOCK::S(K)
      • S(c);N_GUARD,S_CUTQ(f)::QAR(G)+P(H)
      • S(c);N_GUARD,S_CUTR(g)::R(L)
      • S(c);OGATE::QAR(G),XR(g)
      • S(c);N_GUARD,S_CUTR(h)::R1(L)
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