MESON Chess Problem Database

Problem Display
PID: 109390 (8/2BpnN2/q2Rr2b/p1p4p/Q4NpR/2P1k3/2P1p3/4K2B w - - 0 1)

Sim, Malcolm

Saturday Night, 1956

8/2BpnN2/q2Rr2b/p1p4p/Q4NpR/2P1k3/2P1p3/4K2B

#2

10 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.Rxd3#
    • 1...Qb7
      • 2.Rd3#
    • 1...Qc8
      • 2.Rd3#
    • 1...Qb6
      • 2.Rd3#
    • 1...Qc6
      • 2.Rd3#
    • 1...Qa7
      • 2.Rd3#
    • 1...Qa8
      • 2.Rd3#
    • 1...Re4
      • 2.Qxe4#
    • 1...Rxd6
      • 2.Qe4#
    • 1...Rf6
      • 2.Qe4#
    • 1...Rg6
      • 2.Qe4#
    • 1...Sd5
      • 2.Sxd5#
    • 1...Sf5
      • 2.Sd5#
    • 1...Sc6
      • 2.Sd5#
    • 1...Sg6
      • 2.Sd5#
    • 1...Sc8
      • 2.Sd5#
    • 1...Sg8
      • 2.Sd5#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Sg2#
      • 1...Qb7
        • 2.Rd3#
      • 1...Qc6
        • 2.Rd3#
      • 1...Qa8
        • 2.Rd3#
      • 1...Bxg5!
    • 1.Rh3+?
      • 1...g3
        • 2.Rxg3#
      • 1...gxh3!
    • 1.Rxe6+?
      • 1...dxe6
        • 2.Qe4#
      • 1...Qxe6!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Sg2#
      • 1...Kxf4
        • 2.Qf3#
      • 1...Qxc6
        • 2.Rd3#
      • 1...Bxf4
        • 2.Qxc5#
      • 1...Sxc6
        • 2.Sd5#
      • 1...dxc6
        • 2.Rxe6#
      • 1...Re4
        • 2.Qxe4#
      • 1...Sd5
        • 2.Sxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 13
  • Sets
    • Q(g);N_GUARD::R1(H),XQ(g)
    • Q(g);N_GUARD::R1(H)
    • R(h);N_GUARD::QAR1(E),XR(h)
    • R(h);N_GUARD,XR(H)::QAR1(E)
    • R(h);N_GUARD::QAR1(E)
    • S(k);N_GUARD::S(F),XS(k)
    • S(k);N_GUARD::S(F)
  • Tries
    • Try
      • S(J);
      • Threat
        • S(F)
      • Vars
        • Q(g);N_GUARD::R1(H)
      • Refutation
        • B(i);XS(J)
    • Try
      • R(G);CHECK
      • Vars
        • P(c);P_SPINP(c)::R(G),XP(c)
      • Refutation
        • P(c);XR(G)
    • Try
      • R(H);CHECK,XR(h)
      • Vars
        • P(j);XR(H)::QAR1(E)
      • Refutation
        • Q(g);XR(H)
  • Actual
    • Q(E);
    • Threat
      • S(F)
    • Vars
      • K(b);P_SPINP(c),S_FLIGHT,XS(F)::QAR1(E)
      • Q(g);N_GUARD,XQ(E)::R1(H)
      • B(i);SBLOCK,XS(F)::QAB(E),XP(e)
      • S(k);N_GUARD,XQ(E)::S(F)
      • P(j);N_GUARD,XQ(E)::R(H),XR(h)
      • R(h);N_GUARD::QAR1(E),XR(h)
      • S(k);N_GUARD::S(F),XS(k)
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