MESON Chess Problem Database

Problem Display
PID: 23246 (K7/1B1N2p1/p3p3/3n3n/R1Rrk1P1/2Q1b2N/6P1/3q4 w - - 0 1)

Saunders, Denis M

Shanahan, Ian

The Problemist, 1996

K7/1B1N2p1/p3p3/3n3n/R1Rrk1P1/2Q1b2N/6P1/3q4

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qc2
      • 2.Qxc2#
    • 1...Qf3
      • 2.Qc2#
    • 1...Qxg4
      • 2.Qc2#
    • 1...Qa1
      • 2.Qc2#
    • 1...Qe1
      • 2.Qc2#
    • 1...Qg1
      • 2.Qc2#
    • 1...Qh1
      • 2.Qc2#
    • 1...Bd2
      • 2.Rxd4#
      • 2.Qxd4#
    • 1...Bf4
      • 2.Sf2#
    • 1...Sf4
      • 2.Sg5#
    • 1...e5
      • 2.Sc5#
  • Tries
    • 1.Rxa6?
      • threat
        • 2.Rxe6#
      • 1...Qxg4
        • 2.Qc2#
      • 1...Qa1
        • 2.Qc2#
      • 1...Bf4
        • 2.Sf2#
      • 1...Sf4
        • 2.Sg5#
      • 1...e5
        • 2.Sc5#
      • 1...Qa4!
    • 1.Rxd4+?
      • 1...Qxd4
        • 2.Qc2#
      • 1...Bxd4!
  • Keys
    • 1.Rc6!
      • threat
        • 2.Rxe6#
      • 1...Sb6+
        • 2.Rxb6#
      • 1...Sc7+
        • 2.Rxc7#
      • 1...Qxg4
        • 2.Qc2#
      • 1...Sxc3
        • 2.Rxc3#
      • 1...Bf4
        • 2.Sf2#
      • 1...Shf4
        • 2.Sg5#
      • 1...e5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_GUARD::QAB(B),XQ(a)
    • Q(a);N_GUARD::QAB(B)
    • Q(a);N_GUARD,XP(F)::QAB(B)
    • B(b);N_GUARD,SBLOCK::S(C)
    • S(f);SBLOCK,S_CUTB(b)::S(C)
    • P(h);SBLOCK::S(H)
  • Tries
    • Try
      • R(D);XP(g)
      • Threat
        • R(D),XP(h)
      • Vars
        • Q(a);N_GUARD,XP(F)::QAB(B)
        • Q(a);N_GUARD,P_PINR(D)::QAB(B)
        • B(b);N_GUARD,SBLOCK::S(C)
        • S(f);SBLOCK,S_CUTB(b)::S(C)
        • P(h);SBLOCK::S(H)
      • Refutation
        • Q(a);P_PINR(D)
    • Try
      • R(E);CHECK,XR(c)
      • Vars
        • Q(a);P_SPINQ(a),XR(E)::QAB(B)
      • Refutation
        • B(b);P_SPINB(b),XR(E)
  • Actual
    • R(E);N_PINS(e)
    • Threat
      • R(E),XP(h)
    • Vars
      • S(e);CHECK,OGATEB::B(G)+R(E),XS(e)
      • Q(a);N_GUARD,XP(F)::QAB(B)
      • S(e);OGATE,XQ(B)::B(G)+R(E),XS(e)
      • B(b);N_GUARD,SBLOCK::S(C)
      • S(f);SBLOCK,S_CUTB(b)::S(C)
      • P(h);SBLOCK::S(H)
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