MESON Chess Problem Database

Problem Display
PID: 274001 (qn2B3/rr1n4/b1k1N3/Qp2p3/2N1K3/8/8/8 w - - 0 1)

Boswell, Edward

The Problemist, 1933

qn2B3/rr1n4/b1k1N3/Qp2p3/2N1K3/8/8/8

#2

5 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rb6
      • 2.Qxb6#
    • 1...Rc7
      • 2.Qb6#
    • 1...bxc4
      • 2.Qc5#
    • 1...b4
      • 2.Sd8#
      • 2.Qc5#
      • 2.Qd5#
  • Tries
    • 1.Qd2?
      • threat
        • 2.Qd5#
        • 2.Qd6#
      • 1...Rb6
        • 2.Sa5#
        • 2.Qd5#
      • 1...Rc7
        • 2.Qd5#
      • 1...b4
        • 2.Qd5#
      • 1...bxc4!
    • 1.Qa3?
      • threat
        • 2.Qc5#
        • 2.Qd6#
      • 1...bxc4
        • 2.Qc5#
      • 1...Rb6
        • 2.Sa5#
      • 1...Rc7
        • 2.Sd8#
      • 1...b4!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qc5#
        • 2.Qd6#
      • 1...bxc4
        • 2.Qc5#
      • 1...Rb6
        • 2.Sa5#
      • 1...Rc7
        • 2.Sd8#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(f);N_GUARD::QAR1(C),XR(f)
    • R(f);N_GUARD::QAR1(C)
    • P(a);OGATE,XS(A)::QAR1(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);::QAB1(C)
        • P(a);::QAB1(C)
      • Refutation
        • P(a);XS(A)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);XS(A)::QAR1(C)
        • R(f);SBLOCK::S(A)
        • R(f);SBLOCK::S(D)
      • Refutation
        • P(a);
  • Actual
    • Q(C);
    • Threat
      • DUALS(2)
    • Vars
      • P(a);XS(A)::QAR1(C)
      • R(f);SBLOCK::S(A)
      • R(f);SBLOCK::S(D)
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Developed and maintained by Brian Stephenson.
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