MESON Chess Problem Database

Problem Display
PID: 247681 (2qn4/3p2B1/2n5/3rR1QK/4r2p/PPk5/R1N5/2N5 w - - 0 1)

Avner, Uri

Macleod, Norman Alasdair

The Problemist, 1990

2qn4/3p2B1/2n5/3rR1QK/4r2p/PPk5/R1N5/2N5

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Rc5#
    • 1...Rd2
      • 2.Rc5#
    • 1...Rd3
      • 2.Rc5#
    • 1...Rd4
      • 2.Rc5#
    • 1...Ra5
      • 2.Rc5#
    • 1...Rb5
      • 2.Rc5#
    • 1...Rc5
      • 2.Rxc5#
    • 1...Rd6
      • 2.Rc5#
  • Tries
    • 1.Rxd5+?
      • 1...Rd4
        • 2.Rc5#
        • 2.Qe3#
      • 1...Re5
        • 2.Rd3#
        • 2.Rc5#
      • 1...Se5
        • 2.Rd3#
        • 2.Qd2#
      • 1...Sd4!
    • 1.Qd2+?
      • 1...Rxd2
        • 2.Rc5#
      • 1...Kxd2!
    • 1.Qe3+?
      • 1...Rd3
        • 2.Rc5#
        • 2.Qxd3#
      • 1...Rxe3!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qd2#
      • 1...Kxd4
        • 2.Rxd5#
      • 1...Rexd4
        • 2.Re3#
      • 1...Rexe5
        • 2.Sde2#
      • 1...Rdxd4
        • 2.Rc5#
      • 1...Rdxe5
        • 2.Sb5#
      • 1...Re2
        • 2.Sdxe2#
      • 1...Re3
        • 2.Rxe3#
        • 2.Qxe3#
      • 1...Rf4
        • 2.Sde2#
        • 2.Re3#

This is after 6401

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 7
  • Sets
    • R(d);OGATE::B(I)+R(F),DCHECK
    • R(d);OGATE::R(F)
    • R(d);OGATE::B(I)+R(F),DCHECK,XR(d)
  • Tries
    • Try
      • R(F);CHECK,XR(d)
      • Refutation
        • S(e);P_SPINS(e)
    • Try
      • Q(G);CHECK,P_SPINR(F)
      • Vars
        • R(d);N_PINR(F),SBLOCK,XQ(G)::B(I)+R(F),DCHECK
      • Refutation
        • K(a);S_FLIGHT,XQ(G)
    • Try
      • Q(G);CHECK,P_SPINR(F)
      • Refutation
        • R(b);XQ(G)
  • Actual
    • S(C);
    • Threat
      • QAB1(G)
    • Vars
      • K(a);OGATEB,S_FLIGHT,XS(C)::B(I)+R(F),DCHECK,XR(d)
      • R(b);OGATE,XS(C)::R(F)
      • R(b);N_GUARD,P_PINQ(G),XR(F)::S(C)
      • R(d);OGATE,XS(C)::R(F)
      • R(d);N_GUARD,P_PINQ(G),XR(F)::S(C)
      • R(b);N_GUARD::S(C),XR(b)
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