MESON Chess Problem Database

Problem Display
PID: 266979 (7K/7B/2R1p3/1n1pk1B1/2p5/2r2p2/1QN5/6b1 w - - 0 1)

Rice, John Michael

The Problemist, 1955

7K/7B/2R1p3/1n1pk1B1/2p5/2r2p2/1QN5/6b1

#2

6 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sa3
      • 2.Qb8#
    • 1...Sd4
      • 2.Qb8#
    • 1...Sa7
      • 2.Qb8#
    • 1...d4
      • 2.Qxb5#
  • Tries
    • 1.Sd4?
      • threat
        • 2.Sxf3#
      • 1...Bxd4
        • 2.Qh2#
      • 1...Sxd4
        • 2.Qb8#
      • 1...f2
        • 2.Sf3#
      • 1...Kxd4!
  • Keys
    • 1.Se1!
      • threat
        • 2.Sxf3#
      • 1...Kd4
        • 2.Sxf3#
      • 1...Bd4
        • 2.Qh2#
      • 1...Sd4
        • 2.Qb8#
      • 1...f2
        • 2.Sf3#
      • 1...d4
        • 2.Qxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(e);OGATE::QAB(A)
    • S(e);N_SPINR(b),OGATE::QAB(A)
    • P(f);N_SPINR(b),OGATEB::QAR(A),XS(e)
  • Tries
    • Try
      • S(B);N_PINR(b)
      • Threat
        • S(B),XP(c)
      • Vars
        • B(a);N_GUARD,SBLOCK,XS(B)::QAB(A)
        • S(e);OGATE,SBLOCK,XS(B)::QAB(A)
        • P(c);::S(B)
      • Refutation
        • K(g);P_SPINR(b),S_FLIGHT,XS(B)
  • Actual
    • S(B);
    • Threat
      • S(B),XP(c)
    • Vars
      • K(g);S_FLIGHT::S(B),XP(c)
      • B(a);N_GUARD,N_SPINR(b),SBLOCK::QAB(A)
      • S(e);N_SPINR(b),OGATE,SBLOCK::QAB(A)
      • P(c);::S(B)
      • P(f);N_SPINR(b),OGATEB,SBLOCK::QAR(A),XS(e)
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