MESON Chess Problem Database

Problem Display
PID: 146712 (N5K1/4P1pp/B3R3/kp1rQ3/1Rb5/1p3pq1/3B4/7r w - - 0 1)

Barnes, Barry Peter

Comm., Australian Chess Problem Magazine TT, 1997

N5K1/4P1pp/B3R3/kp1rQ3/1Rb5/1p3pq1/3B4/7r

#2

8 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Qc7#
    • 1...Qh4
      • 2.Qc7#
    • 1...Qg2
      • 2.Qc7#
    • 1...Qh3
      • 2.Qc7#
    • 1...Qg4
      • 2.Qc7#
    • 1...Qg5
      • 2.Qc7#
    • 1...Qg6
      • 2.Qc7#
    • 1...Ra1
      • 2.Qxa1#
    • 1...Rh2
      • 2.Qa1#
    • 1...Rh3
      • 2.Qa1#
    • 1...Rh4
      • 2.Qa1#
    • 1...Rh5
      • 2.Qa1#
    • 1...Rh6
      • 2.Qa1#
    • 1...Rd8+
      • 2.exd8Q#
      • 2.exd8B#
    • 1...Bf1
      • 2.Qa1#
  • Tries
    • 1.Rxc4+?
      • 1...Rxd2
        • 2.Qxb5#
      • 1...b4!
  • Keys
    • 1.Bxb5!
      • threat
        • 2.Ra6#
      • 1...Rd8+
        • 2.exd8Q#
        • 2.exd8B#
      • 1...Rxd2
        • 2.Ra4#
      • 1...Rxb5
        • 2.Rxc4#
      • 1...Rxe5
        • 2.Rxb3#
      • 1...Bxb5
        • 2.Rd4#
      • 1...Qg6
        • 2.Qc7#
      • 1...Rh6
        • 2.Qa1#
      • 1...Rd3
        • 2.Ra4#
      • 1...Rd4
        • 2.Ra4#
      • 1...Rc5
        • 2.Rxb3#
      • 1...Rd6
        • 2.Ra4#
      • 1...Rd7
        • 2.Ra4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 12
  • Sets
    • Q(d);N_GUARD::QAB(C)
    • Q(d);N_GUARD,SBLOCK::QAB(C)
    • R(a);N_GUARD::QAR(C),XR(a)
    • R(a);N_GUARD::QAR(C)
    • R(a);N_GUARD,SBLOCK::QAR(C)
    • R(h);CHECK,OGATE,P_PINR(E),P_SPINP(g)::PXR(h)=Q
    • B(e);S_CUTR(a)::QAR(C)
  • Tries
    • Try
      • R(B);CHECK,XB(e)
      • Vars
        • R(h);OGATE,P_SPINP(g),XB(A)::QAR1(C),XP(g)
      • Refutation
        • P(g);P_SPINP(g),P_SPINR(h)
  • Actual
    • B(D);XP(g)
    • Threat
      • R1(E)
    • Vars
      • R(h);CHECK,OGATE,P_PINR(E)::PXR(h)=Q
      • R(h);P_PINR(E),XB(A)::R1(B)
      • R(h);N_GUARD,P_PINR(E),P_SPINR(h),XB(D)::B(A)+R(B),XB(e)
      • R(h);N_GUARD,P_PINR(E),XQ(C)::B(A)+R(B),XP(b)
      • B(e);OGATE,SBLOCK,XB(D)::B(A)+R(B)
      • Q(d);N_GUARD::QAB(C)
      • R(a);N_GUARD::QAR(C)
      • R(h);P_PINR(E)::B(A)+R(B),DCHECK
      • R(h);N_GUARD,P_PINR(E)::B(A)+R(B),XP(b)
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