MESON Chess Problem Database

Problem Display
PID: 68446 (r5n1/p2RN3/K2npRB1/2p1k3/8/p2p4/2b2N2/2Br3Q w - - 0 1)

Howard, David M

Problem Observer, 2006

r5n1/p2RN3/K2npRB1/2p1k3/8/p2p4/2b2N2/2Br3Q

#2

8 + 11

136 Problem Observer 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf6
      • 2.Qh8#
    • 1...Sc4
      • 2.Sg4#
    • 1...Se4
      • 2.Sg4#
    • 1...Sb5
      • 2.Sg4#
    • 1...Sf5
      • 2.Sg4#
    • 1...Sb7
      • 2.Sg4#
    • 1...Sf7
      • 2.Sg4#
    • 1...Sc8
      • 2.Sg4#
    • 1...Se8
      • 2.Sg4#
    • 1...Sxf6
      • 2.Sc6#
    • 1...a2
      • 2.Bb2#
  • Tries
    • 1.Bf4+?
      • 1...Kxf6
        • 2.Qh8#
      • 1...Kd4!
    • 1.Qe4+?
      • 1...Sxe4
        • 2.Sg4#
      • 1...Kxf6!
    • 1.Qh2+?
      • 1...Kxf6
        • 2.Qh8#
      • 1...Kd4!
    • 1.Qh4?
      • threat
        • 2.Qf4#
      • 1...Sf5
        • 2.Sc6#
        • 2.Bf4#
      • 1...Sxe7!
    • 1.Qh8?
      • threat
        • 2.Rf5#
      • 1...Kd4
        • 2.Rf4#
      • 1...Sf5
        • 2.Sc6#
        • 2.Rxf5#
      • 1...Sxf6!
  • Keys
    • 1.Bd2!
      • threat
        • 2.Bc3#
      • 1...Kd4
        • 2.Qe4#
      • 1...Kxf6
        • 2.Qh8#
      • 1...Rxd2
        • 2.Qa1#
      • 1...Sxf6
        • 2.Sc6#
      • 1...Se4
        • 2.Sg4#
      • 1...Sb5
        • 2.Sg4#
      • 1...Sf5
        • 2.Sg4#

This is after

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • K(f);OGATEB,S_FLIGHT,XR(E)::QAB(B)
    • S(g);::S(C)
    • S(k);SBLOCK,XR(E)::S(H)
    • P(c);N_GUARD::B(A)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • K(f);S_FLIGHT,XR(E)::QAB(B)
      • Refutation
        • K(f);P_SPINS(g),S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • S(g);XQ(B)::S(C)
      • Refutation
        • K(f);S_FLIGHT,XR(E)
    • Try
      • Q(B);CHECK
      • Vars
        • K(f);OGATEB,S_FLIGHT,XR(E)::QAB(B)
      • Refutation
        • K(f);P_SPINS(g),S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Refutation
        • S(k);XS(H)
    • Try
      • Q(B);
      • Threat
        • QAB(B)+R(E),DCHECK
      • Vars
        • K(f);P_SPINS(g),S_FLIGHT::QAB(B)+R(E),DCHECK
      • Refutation
        • S(k);P_SPINS(k),XR(E)
  • Actual
    • B(A);
    • Threat
      • B(A)
    • Vars
      • K(f);P_SPINS(g),S_FLIGHT::QAR1(B)
      • K(f);OGATEB,S_FLIGHT,XR(E)::QAB(B)
      • R(a);OGATE,XB(A)::QAB(B)
      • S(k);SBLOCK,XR(E)::S(H)
      • S(g);::S(C)
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