MESON Chess Problem Database

Problem Display
PID: 48674 (N1R4B/8/qpp5/r1k2N2/pnnRP3/P7/4Q3/6K1 w - - 0 1)

Grimshaw, Walter

Illustrated London News, 1878

(First published on Sat Nov 23 1878)

N1R4B/8/qpp5/r1k2N2/pnnRP3/P7/4Q3/6K1

#2

9 + 8

15351 SCPF/BCPS Black Books 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Kb5
      • 2.Qxc4#
    • 1...Qb7
      • 2.Qxc4#
    • 1...Qxc8
      • 2.Qxc4#
    • 1...Qa7
      • 2.Qxc4#
    • 1...Qxa8
      • 2.Qxc4#
    • 1...Rb5
      • 2.Rxc4#
      • 2.Qxc4#
    • 1...Sa2
      • 2.Rd5#
    • 1...Sc2
      • 2.Rd5#
    • 1...Sd3
      • 2.Rd5#
    • 1...Sd5
      • 2.Rxd5#
    • 1...Sb2
      • 2.axb4#
    • 1...Sd2
      • 2.axb4#
    • 1...Se3
      • 2.axb4#
    • 1...Se5
      • 2.axb4#
    • 1...Sd6
      • 2.axb4#
  • Tries
    • 1.Rxc4+?
      • 1...Kb5
        • 2.Sd4#
        • 2.Sd6#
        • 2.Sc7#
      • 1...Qxc4!
    • 1.Rxc6+?
      • 1...Kb5
        • 2.Qxc4#
      • 1...Sxc6
        • 2.Rd5#
      • 1...Kxc6!
    • 1.axb4+?
      • 1...Kb5
        • 2.Qxc4#
      • 1...Kxb4!
  • Keys
    • 1.Sg7!
      • 1...Kxd4
        • 2.Se6#
      • 1...Kb5
        • 2.Qxc4#
      • 1...Qxc8
        • 2.Qxc4#
      • 1...Qxa8
        • 2.Qxc4#
      • 1...Sxa3
        • 2.Se6#
      • 1...Sd5
        • 2.Rxd5#
      • 1...Qb5
        • 2.Se6#
      • 1...Qb7
        • 2.Qxc4#
      • 1...Qa7
        • 2.Qxc4#
      • 1...Rb5
        • 2.Se6#
        • 2.Qxc4#
      • 1...Sa2
        • 2.Rd5#
      • 1...Sc2
        • 2.Rd5#
      • 1...Sd3
        • 2.Rd5#
      • 1...Sb2
        • 2.Se6#
      • 1...Sd2
        • 2.Se6#
      • 1...Se3
        • 2.Se6#
      • 1...Se5
        • 2.Se6#
      • 1...Sd6
        • 2.Se6#
      • 1...b5
        • 2.Se6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 5
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(e);N_SPINP(h),P-FLIGHT,P_SPINS(c)::QAB1(B),XS(c)
    • Q(f);N_GUARD::QAR1(B),XS(c)
    • Q(f);N_GUARD,N_SPINP(h),XR(H)::QAR1(B),XS(c)
    • Q(f);N_GUARD,XS(G)::QAR1(B),XS(c)
    • S(b);N_GUARD::R1(D)
    • S(b);N_GUARD::R1(D),XS(b)
    • S(c);::P(C),XS(b)
  • Tries
    • Try
      • R(D);CHECK,XS(c)
      • Refutation
        • Q(f);XR(D)
    • Try
      • R(H);CHECK,XP(h)
      • Vars
        • K(e);P-FLIGHT,P_SPINS(c)::QAB1(B),XS(c)
        • S(b);SBLOCK,XR(H)::R1(D)
      • Refutation
        • K(e);P-FLIGHT,XR(H)
    • Try
      • P(C);CHECK,XS(b)
      • Vars
        • K(e);N_SPINP(h),P-FLIGHT,P_SPINS(c)::QAB1(B),XS(c)
      • Refutation
        • K(e);N_SPINP(h),P_SPINS(c),S_FLIGHT,XP(C)
  • Actual
    • S(F);
    • Vars
      • K(e);N_SPINP(h),S_FLIGHT,XR(D)::B(I)+S(F),DCHECK
      • K(e);N_SPINP(h),P-FLIGHT,P_SPINS(c)::QAB1(B),XS(c)
      • Q(f);N_GUARD,N_SPINP(h),XR(H)::QAR1(B),XS(c)
      • Q(f);N_GUARD,XS(G)::QAR1(B),XS(c)
      • S(c);XP(C)::S(F)
      • S(b);N_GUARD::R1(D),XS(b)
      • Q(f);SBLOCK::S(F)
      • Q(f);N_GUARD::QAR1(B),XS(c)
      • S(b);N_GUARD::R1(D)
      • S(c);::S(F)
      • P(g);SBLOCK::S(F)
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