MESON Chess Problem Database

Problem Display
PID: 45346 (3n2B1/6Q1/5b2/3pP1NR/3kn3/BP2pR2/4P3/K2N4 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

3n2B1/6Q1/5b2/3pP1NR/3kn3/BP2pR2/4P3/K2N4

#2

11 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sc5
      • 2.Bb2#
    • 1...Sc6
      • 2.Se6#
    • 1...Se6
      • 2.Sxe6#
    • 1...Sb7
      • 2.Se6#
    • 1...Sf7
      • 2.Se6#
  • Tries
    • 1.Qa7+?
      • 1...Sc5
        • 2.Bb2#
      • 1...Kxe5!
    • 1.Qb7?
      • threat
        • 2.Qxd5#
      • 1...Kxe5
        • 2.Qxd5#
      • 1...Sxb7
        • 2.Se6#
      • 1...Sc6
        • 2.Se6#
      • 1...Se6
        • 2.Sxe6#
      • 1...Sf7
        • 2.Se6#
      • 1...Sc3!
    • 1.Qf7?
      • threat
        • 2.Qxd5#
      • 1...Kxe5
        • 2.Qxd5#
      • 1...Sxf7
        • 2.Se6#
      • 1...Se6
        • 2.Sxe6#
      • 1...Sc3!
  • Keys
    • 1.Rxe3!
      • threat
        • 2.Sf3#
      • 1...Kxe5
        • 2.Se6#
      • 1...Bxg5
        • 2.Rd3#
      • 1...Sxg5
        • 2.Qa7#
      • 1...Sd2
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • S(c);N_GUARD,SBLOCK::B(D)
    • S(f);N_GUARD::S(H)
    • S(f);N_GUARD::S(H),XS(f)
  • Tries
    • Try
      • Q(J);CHECK
      • Vars
        • S(c);P_SPINS(c)::B(D)
      • Refutation
        • K(b);S_FLIGHT,XP(G)
    • Try
      • Q(J);
      • Threat
        • QAR1(J),XP(d)
      • Vars
        • K(b);S_FLIGHT,XP(G)::QAR1(J),XP(d)
        • S(f);N_GUARD,XQ(J)::S(H)
        • S(f);N_GUARD::S(H)
        • S(f);N_GUARD::S(H),XS(f)
      • Refutation
        • S(c);
    • Try
      • Q(J);
      • Threat
        • QAR1(J),XP(d)
      • Vars
        • K(b);S_FLIGHT,XP(G)::QAR1(J),XP(d)
        • S(f);N_GUARD,XQ(J)::S(H)
        • S(f);N_GUARD::S(H),XS(f)
      • Refutation
        • S(c);
  • Actual
    • R(F);XP(a)
    • Threat
      • S(H)
    • Vars
      • K(b);P_SPINB(e),P_SPINS(c),S_FLIGHT,XP(G)::R(I)+S(H)
      • B(e);XS(H)::R1(F)
      • S(c);N_GUARD,XS(H)::QAB(J)
      • S(c);N_GUARD::QAB(J)
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