MESON Chess Problem Database

Problem Display
PID: 268040 (2N4N/3p1p2/R1b2k1P/2rQnB2/3n2PP/3rp3/1B6/b5RK w - - 0 1)

Thornber, David

The Problemist, 1999

2N4N/3p1p2/R1b2k1P/2rQnB2/3n2PP/3rp3/1B6/b5RK

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Sdf3
      • 2.Qxf7#
    • 1...Sxf5
      • 2.g5#
    • 1...Sef3
      • 2.Qd6#
    • 1...Sc4
      • 2.g5#
    • 1...Sg6
      • 2.g5#
  • Keys
    • 1.Rf1!
      • threat
        • 2.g5#
      • 1...Sxg4
        • 2.Bxg4#
      • 1...Se6
        • 2.Bxe6#
      • 1...Sdf3
        • 2.Qxf7#
      • 1...Sef3
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • S(d);N_PINQ(F),P_SPINS(f)::QAR1(F),XP(j)
    • S(d);P_SPINS(f),SBLOCK,XB(G)::P(D)
    • S(f);N_PINQ(F),P_SPINS(d)::QAR2(F)
    • S(f);P_SPINS(d)::P(D)
  • Actual
    • R(A);
    • Threat
      • P(D)
    • Vars
      • S(f);OGATE,P_SPINS(d),XP(D)::R(A)+B(G),XS(f)
      • S(d);N_GUARD,N_SPINB(g),P_SPINS(f)::R(A)+B(G),XS(d)
      • S(d);N_PINQ(F),P_SPINS(f)::QAR1(F),XP(j)
      • S(f);N_PINQ(F),P_SPINS(d)::QAR2(F)
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