MESON Chess Problem Database

Problem Display
PID: 15327 (2Kn4/1N1R4/p1k1p3/P4p2/3p4/q7/8/Qn3Bb1 w - - 0 1)

Froberg, Johan Hilding Laurentius

Problemas, 1982

2Kn4/1N1R4/p1k1p3/P4p2/3p4/q7/8/Qn3Bb1

#2

6 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Rd6#
      • 2.Qa4#
    • 1...Qb2
      • 2.Rd6#
    • 1...Qc5
      • 2.Sxd8#
    • 1...Qd6
      • 2.Rxd6#
    • 1...Qe7
      • 2.Qa4#
    • 1...Qf8
      • 2.Qa4#
    • 1...Qxa1
      • 2.Rd6#
    • 1...Qa2
      • 2.Rd6#
    • 1...Qb3
      • 2.Rd6#
    • 1...Qc3
      • 2.Rd6#
      • 2.Qa4#
    • 1...Qe3
      • 2.Rd6#
      • 2.Qa4#
    • 1...Qf3
      • 2.Rd6#
      • 2.Qa4#
    • 1...Qg3
      • 2.Qa4#
    • 1...Qh3
      • 2.Rd6#
      • 2.Qa4#
    • 1...Qa4
      • 2.Rd6#
      • 2.Qxa4#
    • 1...Qxa5
      • 2.Rd6#
  • Tries
    • 1.Bg2+?
      • 1...Qf3
        • 2.Qa4#
      • 1...Kb5!
    • 1.Qxb1?
      • threat
        • 2.Qb6#
      • 1...Qxa5
        • 2.Rd6#
      • 1...Qd6
        • 2.Rxd6#
      • 1...Qb2
        • 2.Rd6#
      • 1...Qc5
        • 2.Sxd8#
      • 1...Qb3
        • 2.Rd6#
      • 1...d3
        • 2.Bg2#
      • 1...Qb4!
    • 1.Qxa3?
      • threat
        • 2.Sxd8#
        • 2.Rd6#
        • 2.Qc5#
        • 2.Qd6#
        • 2.Qf3#
        • 2.Qa4#
      • 1...Sxa3
        • 2.Rd6#
      • 1...d3
        • 2.Qa4#
      • 1...Bh2
        • 2.Sxd8#
        • 2.Qc5#
        • 2.Qf3#
        • 2.Qa4#
      • 1...Be3
        • 2.Sxd8#
        • 2.Rd6#
        • 2.Qc5#
        • 2.Qd6#
        • 2.Qa4#
      • 1...Sd2
        • 2.Sxd8#
        • 2.Rd6#
        • 2.Qc5#
        • 2.Qd6#
        • 2.Qa4#
      • 1...Sc3
        • 2.Sxd8#
        • 2.Rd6#
        • 2.Qc5#
        • 2.Qd6#
      • 1...Sf7
        • 2.Qc5#
        • 2.Qf3#
        • 2.Qa4#
      • 1...e5
        • 2.Sxd8#
        • 2.Rd6#
        • 2.Qc5#
        • 2.Qd6#
        • 2.Qa4#
      • 1...Sxb7!
  • Keys
    • 1.Qb2!
      • threat
        • 2.Qb6#
      • 1...Qxb2
        • 2.Rd6#
      • 1...Qxa5
        • 2.Rd6#
      • 1...Qd6
        • 2.Rxd6#
      • 1...Qb4
        • 2.Qg2#
      • 1...Qc5
        • 2.Sxd8#
      • 1...Qb3
        • 2.Rd6#
      • 1...d3
        • 2.Bg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(c);N_GUARD::R1(E)
    • Q(c);SBLOCK::S(D),XS(i)
    • Q(c);N_GUARD::R1(E),XQ(c)
    • Q(c);OGATE::QAB(A)
    • Q(c);N_GUARD,XQ(A)::R1(E)
    • Q(c);N_GUARD,XP(C)::R1(E)
  • Tries
    • Try
      • B(B);CHECK
      • Vars
        • Q(c);OGATE,P_SPINQ(c)::QAB(A)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • Q(A);XS(a)
      • Threat
        • QAR1(A)
      • Vars
        • Q(c);N_GUARD,XP(C)::R1(E)
        • Q(c);N_GUARD::R1(E),XQ(c)
        • Q(c);N_GUARD::R1(E)
        • Q(c);SBLOCK::S(D),XS(i)
        • P(d);S_CUTQ(c)::B(B)
      • Refutation
        • Q(c);
    • Try
      • Q(A);XQ(c)
      • Threat
        • DUALS(6)
      • Vars
        • S(a);XQ(A)::R1(E)
        • P(d);::QAB(A)
      • Refutation
        • S(i);XS(D)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • Q(c);N_GUARD,XQ(A)::R1(E)
      • Q(c);N_GUARD,XP(C)::R1(E)
      • Q(c);N_GUARD::R1(E),XQ(c)
      • Q(c);N_GUARD::QAB(A)
      • Q(c);SBLOCK::S(D),XS(i)
      • Q(c);N_GUARD::R1(E)
      • P(d);S_CUTQ(c)::B(B)
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