MESON Chess Problem Database

Problem Display
PID: 986 (8/8/R1R5/1k6/b1p5/Pn6/3p4/1Q1K4 w - - 0 1)

Shanahan, Ian

The Problemist Supplement, 1995

8/8/R1R5/1k6/b1p5/Pn6/3p4/1Q1K4

#2

5 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...c3
      • 2.Qd3#
  • Tries
    • 1.Rd6?
      • 1...Kc5
        • 2.Qf5#
      • 1...c3!
    • 1.Rc7?
      • 1...c3
        • 2.Qd3#
      • 1...Kxa6!
    • 1.Rc8?
      • 1...c3
        • 2.Qd3#
      • 1...Kxa6!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qxc4#
      • 1...c3
        • 2.Qd3#
      • 1...Sa1
        • 2.Qxa4#
      • 1...Sc1
        • 2.Qxa4#
      • 1...Sd4
        • 2.Qxa4#
      • 1...Sa5
        • 2.Rab6#
      • 1...Sc5
        • 2.Rcb6#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • P(d);OGATEB::QAB(A)
  • Tries
    • Try
      • R(E);
      • Vars
        • K(e);N_SPINS(b),P-FLIGHT::QAR(A)
      • Refutation
        • P(d);
    • Try
      • R(E);
      • Vars
        • P(d);OGATEB::QAB(A)
      • Refutation
        • K(e);N_SPINS(b),S_FLIGHT,XR(D)
    • Try
      • R(E);
      • Vars
        • P(d);OGATEB::QAB(A)
      • Refutation
        • K(e);N_SPINS(b),S_FLIGHT,XR(D)
  • Actual
    • Q(A);N_PINS(b)
    • Threat
      • QAB1(A),XP(d)
    • Vars
      • P(d);OGATEB::QAB(A)
      • S(b);OGATE,P_PINQ(A)::QAB1(A),XB(c)
      • S(b);P_PINQ(A),SBLOCK::R1(D)
      • S(b);P_PINQ(A),SBLOCK::R1(E)
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