MESON Chess Problem Database

Problem Display
PID: 147028 (4rN1b/2n5/3q4/2pPkN2/7Q/3R1P1B/8/7K w - - 0 1)

Bicknell, Stephen

Australian Chess Problem Magazine, 1995

4rN1b/2n5/3q4/2pPkN2/7Q/3R1P1B/8/7K

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qe7
      • 2.Sg6#
    • 1...Qa6
      • 2.Sd7#
    • 1...Qb6
      • 2.Sd7#
    • 1...Qf6
      • 2.Sd7#
      • 2.Qg3#
      • 2.Qe4#
    • 1...Qg6
      • 2.Sxg6#
      • 2.Sd7#
    • 1...Qh6
      • 2.Sd7#
    • 1...Qd7
      • 2.Sg6#
      • 2.Sxd7#
    • 1...Qd8
      • 2.Sg6#
    • 1...Bf6
      • 2.Sg6#
      • 2.Qg3#
      • 2.Qe4#
    • 1...Se6
      • 2.Sg6#
    • 1...c4
      • 2.Qd4#
  • Tries
    • 1.Sxd6?
      • threat
        • 2.Sc4#
        • 2.Sf7#
      • 1...Rxf8
        • 2.Sc4#
      • 1...Re7
        • 2.Sc4#
      • 1...c4
        • 2.Sxc4#
        • 2.Sf7#
      • 1...Kxd6!
    • 1.Sh7?
      • threat
        • 2.Qg3#
        • 2.Qe4#
      • 1...Sxd5
        • 2.Qe4#
      • 1...Qg6
        • 2.Qe4#
      • 1...Qh6
        • 2.Qe4#
      • 1...Rg8
        • 2.Qe4#
      • 1...Se6
        • 2.Qe4#
      • 1...Qxd5!
    • 1.Qe1+?
      • 1...Kf4
        • 2.Qg3#
      • 1...Kf6!
    • 1.Qxh8+?
      • 1...Qf6
        • 2.Sg6#
      • 1...Kf4!
  • Keys
    • 1.Rd4!
      • threat
        • 2.f4#
      • 1...Qxd5
        • 2.Qxh8#
      • 1...Sxd5
        • 2.Re4#
      • 1...cxd4
        • 2.Qxd4#
      • 1...Qh6
        • 2.Sd7#
      • 1...Se6
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(c);N_GUARD::S(H)
    • S(d);S_CUTQ(c)::S(H)
    • P(a);N_GUARD::QAB1(E)
  • Tries
    • Try
      • S(G);XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(e);XS(H)::S(G)
        • R(e);::S(G)
      • Refutation
        • K(b);S_FLIGHT,XS(G)
    • Try
      • S(H);
      • Threat
        • DUALS(2)
      • Vars
        • S(d);XP(F)::QAR1(E)
        • Q(c);::QAR1(E)
        • R(e);::QAR1(E)
        • S(d);::QAR1(E)
      • Refutation
        • Q(c);P_PINP(C),XP(F)
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(E)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(E);CHECK,XB(f)
      • Vars
        • Q(c);P_SPINQ(c)::S(H)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • R(B);
    • Threat
      • P(C)
    • Vars
      • Q(c);N_GUARD,P_PINP(C),XP(F)::QAB(E),XB(f)
      • S(d);SBLOCK,XP(F)::R1(B)
      • P(a);OGATE,XR(B)::QAB1(E),XP(a)
      • Q(c);N_GUARD::S(H)
      • S(d);S_CUTQ(c)::S(H)
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