MESON Chess Problem Database

Problem Display
PID: 71283 (5B1K/Q7/8/nk2NN2/8/8/bP2n3/1R1R1B2 w - - 0 1)

Lincoln, Robert A

The Problemist, 2006

5B1K/Q7/8/nk2NN2/8/8/bP2n3/1R1R1B2

#2

9 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3
      • 2.Bxe2#
    • 1...Sc4
      • 2.Rd5#
    • 1...Sb7
      • 2.Sd4#
  • Tries
    • 1.Rd4?
      • threat
        • 2.Sd6#
        • 2.Rb4#
      • 1...Sc4
        • 2.Rd5#
      • 1...Sc6
        • 2.Sd6#
      • 1...Sb7
        • 2.Rb4#
      • 1...Bc4!
    • 1.Qc5+?
      • 1...Ka4
        • 2.Qb4#
      • 1...Ka6!
    • 1.Qb6+?
      • 1...Ka4
        • 2.Qb4#
      • 1...Kxb6!
    • 1.Qb7+?
      • 1...Ka4
        • 2.Qb4#
      • 1...Sxb7!
    • 1.b3?
      • threat
        • 2.Sd4#
        • 2.Rd5#
      • 1...Sc4
        • 2.Rd5#
        • 2.bxc4#
      • 1...Sc6
        • 2.Bxe2#
        • 2.Rd5#
      • 1...Sb7
        • 2.Sd4#
        • 2.Bxe2#
      • 1...Bxb3!
  • Keys
    • 1.b4!
      • threat
        • 2.Qxa5#
      • 1...Ka4
        • 2.Qxa5#
      • 1...Sb3
        • 2.Bxe2#
      • 1...Sc4
        • 2.Rd5#
      • 1...Sc6
        • 2.Sd6#
      • 1...Sb7
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD,S_CUTB(a)::B(C),XS(b)
    • S(c);N_SPINS(b),S_CUTB(a)::R(B)
    • S(c);::S(F)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);N_SPINS(b),S_CUTB(a)::R(B)
        • S(c);::S(F)
        • S(c);::R1(B)
      • Refutation
        • B(a);N_SPINS(b)
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);N_SPINS(b),S_FLIGHT::QAR1(G)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);N_SPINS(b),OGATE,S_FLIGHT::QAR1(G)
      • Refutation
        • K(d);N_SPINS(b),P-FLIGHT,XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);N_SPINS(b),OGATE,S_FLIGHT::QAR1(G)
      • Refutation
        • S(c);XQ(G)
    • Try
      • P(D);
      • Threat
        • DUALS(2)
      • Refutation
        • B(a);P_SPINB(a),XP(D)
  • Actual
    • P(D);
    • Threat
      • QAR1(G),XS(c)
    • Vars
      • K(d);N_SPINS(b),P_SPINS(c),S_FLIGHT::QAR1(G),XS(c)
      • S(c);N_GUARD,S_CUTB(a)::B(C),XS(b)
      • S(c);N_SPINS(b),S_CUTB(a)::R(B)
      • S(c);::S(F)
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