MESON Chess Problem Database

Problem Display
PID: 232082 (8/7N/6K1/3pp1P1/1p1Pk1p1/1pn2RR1/1B3P2/2n2Q2 w - - 0 1)

Mercer, WH

Pen & Pencil, 1889

(First published on Sat Aug 24 1889)

8/7N/6K1/3pp1P1/1p1Pk1p1/1pn2RR1/1B3P2/2n2Q2

#2

9 + 8

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...S1a2
      • 2.Qd3#
    • 1...Sd3
      • 2.Qxd3#
    • 1...Sb1
      • 2.Sf6#
    • 1...Sd1
      • 2.Sf6#
    • 1...S3a2
      • 2.Sf6#
    • 1...Se2
      • 2.Sf6#
    • 1...Sa4
      • 2.Sf6#
    • 1...Sb5
      • 2.Sf6#
    • 1...gxf3
      • 2.Rg4#
  • Tries
    • 1.Qa6?
      • 1...gxf3
        • 2.Rg4#
      • 1...exd4
        • 2.Qe6#
      • 1...S1a2
        • 2.Qd3#
      • 1...S1e2
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sb1
        • 2.Sf6#
      • 1...Sd1
        • 2.Sf6#
      • 1...S3a2
        • 2.Sf6#
      • 1...S3e2
        • 2.Sf6#
      • 1...Sa4
        • 2.Sf6#
      • 1...Sb5
        • 2.Sf6#
      • 1...Kxd4!
    • 1.Qxc1?
      • threat
        • 2.Qe3#
      • 1...exd4
        • 2.Qf4#
      • 1...Sd1
        • 2.Sf6#
        • 2.Qb1#
      • 1...Kxd4!
    • 1.Qd1?
      • threat
        • 2.Sf6#
        • 2.Rxg4#
      • 1...Sxd1
        • 2.Sf6#
      • 1...gxf3
        • 2.Rg4#
      • 1...Sd3
        • 2.Qxd3#
      • 1...S1e2
        • 2.Sf6#
        • 2.Qd3#
      • 1...S3e2
        • 2.Sf6#
      • 1...exd4!
  • Keys
    • 1.Qb5!
      • 1...Kxd4
        • 2.Qxb4#
      • 1...Sxb5
        • 2.Sf6#
      • 1...gxf3
        • 2.Rg4#
      • 1...exd4
        • 2.Qe8#
      • 1...S1a2
        • 2.Qd3#
      • 1...S1e2
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sb1
        • 2.Sf6#
      • 1...Sd1
        • 2.Sf6#
      • 1...S3a2
        • 2.Sf6#
      • 1...S3e2
        • 2.Sf6#
      • 1...Sa4
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB1(A)
    • S(a);N_GUARD::QAB1(A),XS(a)
    • S(c);::S(I)
    • P(f);SBLOCK,XR(D)::R(E)
  • Tries
    • Try
      • Q(A);
      • Vars
        • P(f);SBLOCK,XR(D)::R(E)
        • P(h);OGATEB,SBLOCK,XP(F)::QAR2(A)
        • S(a);N_GUARD::QAB1(A)
        • S(a);N_GUARD::QAB1(A),XS(a)
        • S(c);::S(I)
      • Refutation
        • K(e);P-FLIGHT,P_SPINS(c),XP(F)
    • Try
      • Q(A);XS(a)
      • Threat
        • QAR1(A)
      • Vars
        • P(h);N_GUARD,SBLOCK,XP(F)::QAR1(A)
      • Refutation
        • K(e);P-FLIGHT,P_SPINS(c),XP(F)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);XQ(A)::S(I)
        • P(f);XR(D)::R(E)
        • S(a);N_GUARD::QAB1(A),XS(a)
        • S(c);::S(I)
      • Refutation
        • P(h);XP(F)
  • Actual
    • Q(A);
    • Vars
      • K(e);OGATEB,P-FLIGHT,P_SPINS(c),XP(F)::QAR2(A),XP(d)
      • S(c);XQ(A)::S(I)
      • P(f);SBLOCK,XR(D)::R(E)
      • P(h);OGATEB,SBLOCK,XP(F)::QAR(A)
      • S(a);N_GUARD::QAB1(A)
      • S(a);N_GUARD::QAB1(A),XS(a)
      • S(c);::S(I)
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