MESON Chess Problem Database

Problem Display
PID: 233771 (6KN/7P/5B1k/8/5n2/2P3Nn/8/Q7 w - - 0 1)

Rothwell, Stephen

Freie Presse, 1997

6KN/7P/5B1k/8/5n2/2P3Nn/8/Q7

#2

7 + 3

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sg5
      • 2.Bg7#
    • 1...Sh5
      • 2.Sf5#
    • 1...Sg6
      • 2.Sf7#
  • Tries
    • 1.Qb1?
      • threat
        • 2.Sf7#
      • 1...Sg5
        • 2.Bg7#
      • 1...Sd3!
    • 1.Qh1?
      • 1...Se2
        • 2.Qxh3#
      • 1...Sd3
        • 2.Qxh3#
      • 1...Sd5
        • 2.Qxh3#
      • 1...Sh5
        • 2.Sf5#
      • 1...Se6
        • 2.Qxh3#
      • 1...Sg6
        • 2.Sf7#
      • 1...Sg2!
    • 1.Qa3?
      • threat
        • 2.Qf8#
      • 1...Sh5
        • 2.Sf5#
      • 1...Sg6
        • 2.Sf7#
      • 1...Se6!
    • 1.Qa4?
      • 1...Sg1
        • 2.Qxf4#
      • 1...Sf2
        • 2.Qxf4#
      • 1...Sg5
        • 2.Bg7#
      • 1...Se2
        • 2.Qh4#
      • 1...Sd3
        • 2.Qh4#
      • 1...Sd5
        • 2.Qh4#
      • 1...Sh5
        • 2.Sf5#
      • 1...Se6
        • 2.Qh4#
      • 1...Sg6
        • 2.Sf7#
      • 1...Sg2!
    • 1.Qa5?
      • threat
        • 2.Bg7#
      • 1...Sh5
        • 2.Sf5#
        • 2.Qxh5#
      • 1...Se6
        • 2.Qh5#
      • 1...Sd5!
    • 1.Qa7?
      • threat
        • 2.Qg7#
      • 1...Sh5
        • 2.Sf5#
      • 1...Se6!
    • 1.Qa8?
      • threat
        • 2.Qf8#
      • 1...Sh5
        • 2.Sf5#
      • 1...Sg6
        • 2.Sf7#
      • 1...Se6!
  • Keys
    • 1.Qc1!
      • 1...Sg1
        • 2.Qxf4#
      • 1...Sf2
        • 2.Qxf4#
      • 1...Sg5
        • 2.Bg7#

This anticipates 50345(2003)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(a);SBLOCK::B(D)
    • S(b);SBLOCK::S(C)
    • S(b);SBLOCK::S(G)
  • Tries
    • Try
      • Q(A);
      • Threat
        • S(G)
      • Vars
        • S(a);SBLOCK::B(D)
      • Refutation
        • S(b);
    • Try
      • Q(A);P_PINS(a)
      • Vars
        • S(b);N_GUARD::QAR(A),XS(a)
        • S(b);N_SPINS(a),SBLOCK::S(C)
        • S(b);SBLOCK::S(G)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • S(b);SBLOCK::S(C)
        • S(b);SBLOCK::S(G)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Vars
        • S(a);N_GUARD::QAB(A),XS(b)
        • S(a);SBLOCK::B(D)
        • S(b);OGATE::QAR2(A)
        • S(b);SBLOCK::S(C)
        • S(b);SBLOCK::S(G)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Threat
        • B(D)
      • Vars
        • S(b);N_GUARD::QAR1(A)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • S(b);SBLOCK::S(C)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • S(b);SBLOCK::S(C)
        • S(b);SBLOCK::S(G)
      • Refutation
        • S(b);
  • Actual
    • Q(A);P_PINS(b)
    • Vars
      • S(a);N_GUARD::QAB(A),XS(b)
      • S(a);N_SPINS(b),SBLOCK::B(D)
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