MESON Chess Problem Database

Problem Display
PID: 53506 (1nb3B1/1P2pp1K/R1P1k2p/4q3/6P1/3Q2B1/8/4Rn2 w - - 0 1)

Dobbs, Gilbert S

The Chess Review, 1934

1nb3B1/1P2pp1K/R1P1k2p/4q3/6P1/3Q2B1/8/4Rn2

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe1
      • 2.Qf5#
    • 1...Qe2
      • 2.Qf5#
    • 1...Qe3
      • 2.Qf5#
    • 1...Sxc6
      • 2.Rxc6#
    • 1...Sd7
      • 2.cxd7#
  • Tries
    • 1.Bxf7+?
      • 1...Kf6
        • 2.Qg6#
      • 1...Kxf7!
    • 1.Qc4+?
      • 1...Kd6
        • 2.Bxe5#
      • 1...Kf6!
    • 1.Qf5+?
      • 1...Kd6
        • 2.Qxe5#
      • 1...Kd5!
    • 1.Qd5+?
      • 1...Kf6
        • 2.Qxe5#
      • 1...Kxd5!
    • 1.c7+?
      • 1...Sc6
        • 2.Rxc6#
      • 1...Sxa6!
    • 1.bxc8Q+?
      • 1...Sd7
        • 2.cxd7#
        • 2.c7#
      • 1...Kf6!
    • 1.bxc8B+?
      • 1...Sd7
        • 2.cxd7#
        • 2.c7#
      • 1...Kf6!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qxe5#
      • 1...Qe4+
        • 2.Qf5#
      • 1...Kd6
        • 2.Qxe5#
      • 1...Kf6
        • 2.Qxe5#
      • 1...Qxe1
        • 2.Qf5#
      • 1...Sxc6
        • 2.Qxc6#
      • 1...Qe2
        • 2.Qf5#
      • 1...Qe3
        • 2.Qf5#
      • 1...Sd7
        • 2.cxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(b);N_SPINQ(b),XR(A)::QAB1(B)
    • Q(b);::QAB1(B)
    • S(g);OGATE,P_SPINS(g),XP(F)::R(E),XS(g)
    • S(g);OGATE::R(E)+P(F),XS(g)
  • Tries
    • Try
      • B(I);CHECK,XP(f)
      • Vars
        • K(c);N_SPINQ(b),P-FLIGHT::QAR1(B)
      • Refutation
        • K(c);N_SPINQ(b),S_FLIGHT,XB(I)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);N_SPINP(f),P-FLIGHT::B(C),XQ(b)
      • Refutation
        • K(c);N_SPINP(f),N_SPINQ(b),P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);N_SPINP(f),P-FLIGHT::QAB1(B),XQ(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);N_SPINP(f),N_SPINQ(b),P-FLIGHT::QAB1(B),XQ(b)
      • Refutation
        • K(c);N_SPINQ(b),S_FLIGHT,XQ(B)
    • Try
      • P(F);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::R(E),XS(g)
      • Refutation
        • S(g);XR(E)
    • Try
      • P(G);CHECK,XB(h)
      • Refutation
        • K(c);N_SPINP(f),N_SPINQ(b),P-FLIGHT
    • Try
      • P(G);CHECK,XB(h)
      • Refutation
        • K(c);N_SPINP(f),N_SPINQ(b),P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR1(B),XQ(b)
    • Vars
      • Q(b);CHECK,OGATE::QAB1(B)
      • K(c);N_SPINP(f),P-FLIGHT::QAB1(B),XQ(b)
      • K(c);N_SPINP(f),N_SPINQ(b),P-FLIGHT::QAB1(B),XQ(b)
      • Q(b);N_SPINQ(b),OGATE,XR(A)::QAB1(B)
      • S(g);OGATE,P_SPINS(g),XP(F)::QAR2(B),XS(g)
      • Q(b);OGATE::QAB1(B)
      • S(g);OGATE::R(E)+P(F),XS(g)
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