MESON Chess Problem Database

Problem Display
PID: 147054 (q7/p1N3b1/3p4/R4p2/1Qn1k2r/1N1rP3/1nBP2PB/1b2RK2 w - - 0 1)

Saunders, Denis M

Australian Chess Problem Magazine TT, 1995-1996

q7/p1N3b1/3p4/R4p2/1Qn1k2r/1N1rP3/1nBP2PB/1b2RK2

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4+
      • 2.exf4#
    • 1...f4
      • 2.exf4#
    • 1...d5
      • 2.Sc5#
  • Tries
    • 1.Re5+?
      • 1...dxe5
        • 2.Sc5#
      • 1...Bxe5!
    • 1.Qxc4+?
      • 1...Bd4
        • 2.Qxd4#
        • 2.exd4#
      • 1...Sxc4!
    • 1.Qb7+?
      • 1...d5
        • 2.Sc5#
      • 1...Qxb7!
  • Keys
    • 1.Qxd6!
      • threat
        • 2.Sc5#
      • 1...Rf4+
        • 2.Qxf4#
      • 1...Sxd2+
        • 2.Sxd2#
      • 1...Sxe3+
        • 2.Rxe3#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Qc6
        • 2.Qxc6#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Sa4
        • 2.Qxd3#
      • 1...f4
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • R(f);CHECK,OGATE::R(A)+P(H),XR(f)
    • P(g);OGATE::R(A)+P(H),XP(g)
    • P(h);N_GUARD::S(G)
  • Tries
    • Try
      • R(J);CHECK
      • Vars
        • P(h);XR(J)::S(G)
      • Refutation
        • B(j);XR(J)
    • Try
      • Q(I);CHECK,XS(d)
      • Refutation
        • S(b);XQ(I)
    • Try
      • Q(I);CHECK,N_PINS(d)
      • Vars
        • P(h);P_SPINP(h)::S(G)
      • Refutation
        • Q(k);XQ(I)
  • Actual
    • Q(I);N_PINS(d),XP(h)
    • Threat
      • S(G)
    • Vars
      • R(f);CHECK,N_GUARD::QAR1(I),XR(f)
      • S(d);CHECK,XP(D)::S(G),XS(d)
      • S(d);CHECK,OGATE,P_SPINS(d),XP(H)::R1(A),XS(d)
      • Q(k);N_GUARD::QAB1(I),XQ(k)
      • Q(k);N_GUARD::QAB(I),XQ(k)
      • B(j);N_GUARD::QAR1(I),XB(j)
      • S(b);N_GUARD::QAB1(I),XR(c)
      • P(g);OGATEB::QAB(I)
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