MESON Chess Problem Database

Problem Display
PID: 1159 (3K4/1Q2p3/8/3np3/2P1k1P1/bN1r2RN/5P2/4r3 w - - 0 1)

Shanahan, Ian

Problem Observer, 1994

3K4/1Q2p3/8/3np3/2P1k1P1/bN1r2RN/5P2/4r3

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb3
      • 2.Qxd5#
    • 1...Rc3
      • 2.Qxd5#
    • 1...Re3
      • 2.Qxd5#
    • 1...Rf3
      • 2.Qxd5#
    • 1...Rxg3
      • 2.Qxd5#
    • 1...e6
      • 2.Qh7#
  • Tries
    • 1.Rxd3?
      • threat
        • 2.Qxd5#
      • 1...e6
        • 2.Qh7#
      • 1...Kxd3!
    • 1.Re3+?
      • 1...Rdxe3
        • 2.Qxd5#
      • 1...Rexe3!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qf5#
      • 1...Rxb3
        • 2.Qxd5#
      • 1...Rf3
        • 2.Qxd5#
      • 1...Sc3
        • 2.Qxd3#
      • 1...Se3
        • 2.f3#
      • 1...Sb4
        • 2.Sc5#
      • 1...Sf4
        • 2.Sg5#
      • 1...Sb6
        • 2.Qxd3#
      • 1...Sf6
        • 2.Qxd3#
      • 1...Sc7
        • 2.Qxd3#
      • 1...e6
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 3
  • Sets
    • R(c);N_GUARD,XS(B)::QAB1(G),XS(e)
    • R(c);N_GUARD::QAB1(G),XS(e)
    • R(c);N_GUARD,XR(C)::QAB1(G),XS(e)
    • P(g);OGATE::QAB(G)
  • Tries
    • Try
      • R(C);XR(c)
      • Threat
        • QAB1(G),XS(e)
      • Vars
        • P(g);OGATE::QAB(G)
      • Refutation
        • K(d);N_SPINS(e),S_FLIGHT,XR(C)
    • Try
      • R(C);CHECK
      • Vars
        • R(c);XR(C)::QAB1(G),XS(e)
      • Refutation
        • R(a);XR(C)
  • Actual
    • Q(G);N_PINS(e)
    • Threat
      • QAB1(G)
    • Vars
      • R(c);N_GUARD,XS(B)::QAB1(G),XS(e)
      • R(c);N_GUARD::QAB1(G),XS(e)
      • S(e);OGATE,P_PINQ(G)::QAB1(G),XR(c)
      • S(e);P_PINQ(G),SBLOCK,S_CUTR(c)::P(A)
      • S(e);P_PINQ(G),S_CUTB(b)::S(B)
      • S(e);P_PINQ(G),SBLOCK::S(D)
      • P(g);OGATE::QAB(G)
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