MESON Chess Problem Database

Problem Display
PID: 141744 (6bQ/3Pp2p/4k3/K3NN1r/ppP3B1/r2q4/8/3RR3 w - - 0 1)

Froberg, Johan Hilding Laurentius

Probleemblad, 1977

6bQ/3Pp2p/4k3/K3NN1r/ppP3B1/r2q4/8/3RR3

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.d8S#
    • 1...Qf1
      • 2.d8S#
    • 1...Qc2
      • 2.d8S#
    • 1...Qe2
      • 2.d8S#
    • 1...Qxc4
      • 2.d8S#
    • 1...Qe4
      • 2.d8S#
    • 1...Qxf5
      • 2.d8S#
    • 1...Qb3
      • 2.d8S#
    • 1...Qc3
      • 2.d8S#
    • 1...Qe3
      • 2.d8S#
    • 1...Qf3
      • 2.d8S#
    • 1...Qg3
      • 2.d8S#
    • 1...Qh3
      • 2.d8S#
    • 1...Qd5+
      • 2.cxd5#
    • 1...Qd6
      • 2.Sd4#
  • Tries
    • 1.Sxd3+?
      • 1...Kf7
        • 2.Qg7#
      • 1...Kxd7!
    • 1.Sf3+?
      • 1...Kf7
        • 2.Qg7#
      • 1...Qe2
        • 2.d8S#
      • 1...Qe4
        • 2.d8S#
      • 1...Qe3
        • 2.d8S#
      • 1...Kxd7!
    • 1.Sc6+?
      • 1...Kf7
        • 2.Qg7#
      • 1...Qe2
        • 2.Sd8#
        • 2.d8S#
      • 1...Qe4
        • 2.Sd8#
        • 2.d8S#
      • 1...Qe3
        • 2.Sd8#
        • 2.d8S#
      • 1...Kxd7!
    • 1.Sg6+?
      • 1...Kf7
        • 2.Qg7#
      • 1...Qe2
        • 2.d8S#
      • 1...Qe4
        • 2.d8S#
      • 1...Qe3
        • 2.d8S#
      • 1...Kxd7!
    • 1.Sf7+?
      • 1...Kxf7
        • 2.Qg7#
      • 1...Qe2
        • 2.Sd8#
        • 2.d8S#
      • 1...Qe4
        • 2.Sd8#
        • 2.d8S#
      • 1...Qe3
        • 2.Sd8#
        • 2.d8S#
      • 1...Kxd7!
    • 1.Sg7+?
      • 1...Kf6
        • 2.Se6#
      • 1...Kd6!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qxe7#
      • 1...Qd5+
        • 2.cxd5#
      • 1...Qxf5
        • 2.d8S#
      • 1...Qxd7
        • 2.Sd3#
      • 1...Rxf5
        • 2.Qh6#
      • 1...Qd6
        • 2.Sd4#
      • 1...Bf7
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 12
  • Sets
    • Q(b);N_GUARD::P=S
    • Q(b);N_GUARD,XP(C)::P=S
    • Q(b);N_GUARD,P_PINS(F),P_SPINQ(b),XS(G)::P=S
    • Q(b);CHECK,OGATE::P(C),XQ(b)
    • Q(b);SBLOCK::B(D)+S(G),DCHECK
  • Tries
    • Try
      • S(F);CHECK,P_SPINS(G),XQ(b)
      • Vars
        • K(f);S_FLIGHT::QAR1(I)
      • Refutation
        • K(f);S_FLIGHT,XP(H)
    • Try
      • S(F);CHECK,P_SPINS(G)
      • Vars
        • K(f);S_FLIGHT::QAR1(I)
        • Q(b);N_GUARD,P_SPINQ(b)::P=S
      • Refutation
        • K(f);P_SPINQ(b),S_FLIGHT,XP(H)
    • Try
      • S(F);CHECK,P_SPINS(G)
      • Vars
        • K(f);S_FLIGHT::QAR1(I)
      • Refutation
        • K(f);P_SPINQ(b),S_FLIGHT,XP(H)
    • Try
      • S(F);CHECK,P_SPINS(G)
      • Vars
        • K(f);S_FLIGHT::QAR1(I)
        • Q(b);N_GUARD,P_SPINQ(b)::P=S
      • Refutation
        • K(f);P_SPINQ(b),S_FLIGHT,XP(H)
    • Try
      • S(F);CHECK,P_SPINS(G)
      • Vars
        • K(f);S_FLIGHT,XS(F)::QAR1(I)
      • Refutation
        • K(f);P_SPINQ(b),S_FLIGHT,XP(H)
    • Try
      • S(G);CHECK,P_SPINS(F)
      • Vars
        • K(f);P-FLIGHT::QAB(I)+S(G)
      • Refutation
        • K(f);P-FLIGHT,P_SPINQ(b)
  • Actual
    • Q(I);
    • Threat
      • QAR1(I),XP(g)
    • Vars
      • Q(b);CHECK,OGATE::P(C),XQ(b)
      • Q(b);N_GUARD,P_PINS(F),P_SPINQ(b),XS(G)::P=S
      • Q(b);SBLOCK,XP(H)::R(B)+S(F)
      • R(e);N_GUARD,P_PINS(F),P_SPINR(e),XS(G)::QAR(I)
      • Q(b);SBLOCK::B(D)+S(G),DCHECK
      • B(i);N_GUARD::QAB1(I),XB(i)
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