MESON Chess Problem Database

Problem Display
PID: 145009 (8/8/8/4B2P/5N2/2PQ4/2KRnknR/3B1b2 w - - 0 1)

Morse, Christopher Jeremy

The Observer, 1961

8/8/8/4B2P/5N2/2PQ4/2KRnknR/3B1b2

#2

9 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Kg1
      • 2.Sh3#
  • Tries
    • 1.Kb1?
      • 1...Kg1
        • 2.Sh3#
      • 1...Ke1!
    • 1.Kb2?
      • 1...Kg1
        • 2.Sh3#
      • 1...Ke1!
    • 1.Kb3?
      • 1...Kg1
        • 2.Sh3#
      • 1...Ke1!
    • 1.Sxe2?
      • threat
        • 2.Bg3#
        • 2.Qg3#
      • 1...Ke1
        • 2.Bg3#
        • 2.Qg3#
      • 1...Bxe2!
    • 1.Sxg2?
      • threat
        • 2.Bd4#
        • 2.Qe3#
      • 1...Kg1
        • 2.Qe3#
      • 1...Bxg2!
    • 1.Bxe2?
      • 1...Ke1
        • 2.Qg3#
      • 1...Kg1
        • 2.Sh3#
      • 1...Bxe2!
    • 1.Bd6?
      • 1...Kg1
        • 2.Sh3#
      • 1...Ke1!
    • 1.Bc7?
      • 1...Kg1
        • 2.Sh3#
      • 1...Ke1!
    • 1.Bb8?
      • 1...Kg1
        • 2.Sh3#
      • 1...Ke1!
    • 1.Rxe2+?
      • 1...Kg1
        • 2.Sh3#
      • 1...Bxe2!
    • 1.Qxe2+?
      • 1...Kg1
        • 2.Sh3#
      • 1...Kg3
        • 2.Sxg2#
        • 2.Rh3#
      • 1...Bxe2!
    • 1.Qe4?
      • 1...Ke1
        • 2.Sd3#
      • 1...Kg1
        • 2.Sh3#
      • 1...Kg3!
    • 1.Qe3+?
      • 1...Ke1
        • 2.Sd3#
      • 1...Kxe3!
    • 1.Qf3+?
      • 1...Ke1
        • 2.Sd3#
      • 1...Kg1
        • 2.Sh3#
      • 1...Kxf3!
    • 1.Qg3+?
      • 1...Kg1
        • 2.Sh3#
      • 1...Kxg3!
    • 1.Qh3?
      • 1...Ke1
        • 2.Sd3#
      • 1...Kg1!
    • 1.c4?
      • 1...Kg1
        • 2.Sh3#
      • 1...Ke1!
    • 1.h6?
      • 1...Kg1
        • 2.Sh3#
      • 1...Ke1!
  • Keys
    • 1.Qf5!
      • 1...Ke1
        • 2.Sd3#
      • 1...Kg1
        • 2.Sh3#
      • 1...Ke3
        • 2.Sd5#
      • 1...Kf3
        • 2.Sxg2#
      • 1...Kg3
        • 2.Sxe2#

This is a version

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(c);N_SPINS(b),S_FLIGHT::S(G)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • K(B);S_FLIGHT
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • S(G);P_PINS(d),XS(b)
      • Threat
        • DUALS(2)
      • Refutation
        • B(a);P_SPINB(a),XS(G)
    • Try
      • S(G);XS(d)
      • Threat
        • DUALS(2)
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::QAB(F)
      • Refutation
        • B(a);P_SPINB(a),XS(G)
    • Try
      • B(A);P_PINS(d),XS(b)
      • Vars
        • K(c);N_SPINS(d),S_FLIGHT::QAB(F)
        • K(c);N_SPINS(d),S_FLIGHT::S(G)
      • Refutation
        • B(a);P_SPINB(a),XB(A)
    • Try
      • B(H);
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • B(H);
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • B(H);
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • R(C);CHECK,P_PINS(d),XS(b)
      • Vars
        • K(c);N_SPINS(d),S_FLIGHT::S(G)
      • Refutation
        • B(a);XR(C)
    • Try
      • Q(F);CHECK,P_PINS(d),XS(b)
      • Vars
        • K(c);N_SPINS(d),S_FLIGHT::S(G)
      • Refutation
        • B(a);P_SPINB(a),XQ(F)
    • Try
      • Q(F);
      • Vars
        • K(c);S_FLIGHT::S(G)
        • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(c);S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT,XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • Refutation
        • K(c);P-FLIGHT,XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • K(c);N_SPINS(b),P_SPINS(d),S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT,XQ(F)
    • Try
      • Q(F);
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • P(E);
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • P(I);
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
  • Actual
    • Q(F);
    • Vars
      • K(c);N_SPINS(b),S_FLIGHT::S(G)
      • K(c);P-FLIGHT::QAR(F)+S(G),XS(d)
      • K(c);N_SPINS(b),S_FLIGHT::B(H)+S(G),DCHECK,XS(b)
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