MESON Chess Problem Database

Problem Display
PID: 898 (3R4/4p3/3q2n1/RQNrk1P1/KB1Np3/1p2PP2/8/1b6 w - - 0 1)

Saunders, Denis M

British Chess Magazine, 1998

3R4/4p3/3q2n1/RQNrk1P1/KB1Np3/1p2PP2/8/1b6

#2

10 + 8

3936 The Wizard of Oz 1999

SOLUTION

  • SOUND
  • Sets
    • 1...Qb8
      • 2.Sd7#
    • 1...Qa6
      • 2.Sd7#
    • 1...Qb6
      • 2.Sd7#
    • 1...Qf6
      • 2.Sd7#
    • 1...Qd7
      • 2.Sxd7#
    • 1...Sh4
      • 2.f4#
    • 1...Sf8
      • 2.f4#
    • 1...Sh8
      • 2.f4#
  • Tries
    • 1.Rxd6?
      • threat
        • 2.Sd7#
        • 2.Re6#
      • 1...Kxd6
        • 2.Qb8#
      • 1...Rxd4
        • 2.Sd3#
        • 2.Sd7#
      • 1...Rxc5
        • 2.Qxc5#
      • 1...Rxd6
        • 2.Sd3#
        • 2.Sd7#
      • 1...exf3
        • 2.Re6#
      • 1...exd6
        • 2.Sd7#
      • 1...Sf4
        • 2.Sd7#
      • 1...e6
        • 2.Sd7#
        • 2.Rxe6#
      • 1...Sf8!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qf5#
      • 1...Qc6+
        • 2.Sxc6#
      • 1...Qxd7+
        • 2.Sxd7#
      • 1...Rxd4
        • 2.Sd3#
      • 1...exf3
        • 2.Sxf3#
      • 1...Qe6
        • 2.Qxe6#
      • 1...Qf6
        • 2.Qxd5#
      • 1...Sh4
        • 2.f4#
      • 1...e6
        • 2.Qg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(f);N_GUARD::S(H)
    • Q(f);N_GUARD,P_PINR(F)::S(H)
    • Q(f);N_GUARD,P_PINQ(G)::S(H),XQ(f)
    • S(g);N_GUARD::P(B)
  • Tries
    • Try
      • R(J);XQ(f)
      • Threat
        • DUALS(2)
      • Vars
        • K(e);OGATEB,S_FLIGHT,XR(J)::QAB(G)
        • R(d);OGATE,P_SPINR(d),XS(H)::QAR2(G),XR(d)
        • P(c);XP(B)::R1(J)
        • P(h);XR(J)::S(H)
        • S(g);::S(H)
      • Refutation
        • S(g);
  • Actual
    • Q(G);
    • Threat
      • QAR1(G)
    • Vars
      • Q(f);CHECK,N_GUARD::S(E),XQ(f)
      • Q(f);CHECK,XQ(G)::S(H),XQ(f)
      • R(d);P_PINB(D),XS(E)::R(F)+S(H),DCHECK
      • P(c);XP(B)::S(E),XP(c)
      • Q(f);N_GUARD::QAR1(G),XQ(f)
      • Q(f);OGATE::QAR1(G),XR(d)
      • S(g);N_GUARD::P(B)
      • P(h);OGATE::QAB(G)
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