MESON Chess Problem Database

Problem Display
PID: 21 (8/2p1R1R1/2P2k2/6p1/5n2/4N3/2b2Q2/K7 w - - 0 1)

Koetsheid, Petrus Albertus

Opdenoordt, Joseph J

5th Prize, Brisbane Courier, 1930

8/2p1R1R1/2P2k2/6p1/5n2/4N3/2b2Q2/K7

#2

6 + 5

5501 Chess Cameos 1936

SOLUTION

  • SOUND
  • Sets
    • 1...Bb1
      • 2.Qb2#
    • 1...Bd1
      • 2.Qb2#
    • 1...Bb3
      • 2.Qb2#
    • 1...Bd3
      • 2.Qb2#
    • 1...Ba4
      • 2.Qb2#
    • 1...Be4
      • 2.Qb2#
    • 1...Bf5
      • 2.Qb2#
    • 1...Bg6
      • 2.Qb2#
    • 1...Bh7
      • 2.Qb2#
    • 1...g4
      • 2.Qh4#
  • Tries
    • 1.Sxc2?
      • 1...g4
        • 2.Qxf4#
      • 1...Kf5!
    • 1.Qg3?
      • threat
        • 2.Qxg5#
      • 1...Sh3
        • 2.Qe5#
      • 1...Se6
        • 2.Ref7#
      • 1...Sg6
        • 2.Rgf7#
      • 1...g4
        • 2.Qh4#
      • 1...Bg6!
    • 1.Qxc2?
      • threat
        • 2.Sg4#
        • 2.Rgf7#
        • 2.Qf5#
        • 2.Qb2#
        • 2.Qc3#
      • 1...Se6
        • 2.Sg4#
        • 2.Qf5#
      • 1...Se2
        • 2.Sg4#
        • 2.Sd5#
        • 2.Rgf7#
        • 2.Qf5#
        • 2.Qg6#
      • 1...Sd5
        • 2.Sg4#
        • 2.Sxd5#
        • 2.Rgf7#
        • 2.Qf5#
        • 2.Qg6#
      • 1...Sg6
        • 2.Sg4#
        • 2.Sd5#
        • 2.Rgf7#
        • 2.Qf5#
        • 2.Qxg6#
      • 1...g4
        • 2.Sxg4#
        • 2.Qf5#
        • 2.Qb2#
        • 2.Qc3#
      • 1...Sd3!
    • 1.Qxf4+?
      • 1...Bf5
        • 2.Sg4#
        • 2.Sd5#
        • 2.Qe5#
        • 2.Qxg5#
        • 2.Qd4#
        • 2.Qxf5#
      • 1...gxf4!
  • Keys
    • 1.Qh2!
      • 1...Bb1
        • 2.Qb2#
      • 1...Bd1
        • 2.Qb2#
      • 1...Bb3
        • 2.Qb2#
      • 1...Bd3
        • 2.Qb2#
      • 1...Ba4
        • 2.Qb2#
      • 1...Be4
        • 2.Qb2#
      • 1...Bf5
        • 2.Qb2#
      • 1...Bg6
        • 2.Qb2#
      • 1...Bh7
        • 2.Qb2#
      • 1...Se2
        • 2.Qe5#
      • 1...Sg2
        • 2.Qe5#
      • 1...Sd3
        • 2.Qh6#
      • 1...Sh3
        • 2.Qe5#
      • 1...Sd5
        • 2.Qe5#
      • 1...Sh5
        • 2.Qe5#
      • 1...Se6
        • 2.Ref7#
      • 1...Sg6
        • 2.Rgf7#
      • 1...g4
        • 2.Qh4#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • B(a);OGATE::QAB(B)
    • B(a);N_SPINS(b),OGATE::QAB(B)
    • P(c);OGATEB::QAB(B)
  • Tries
    • Try
      • S(C);XB(a)
      • Vars
        • P(c);N_GUARD::QAR2(B),XS(b)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(B);N_PINS(b)
      • Threat
        • QAB1(B),XP(c)
      • Vars
        • S(b);OGATE::QAB1(B)
        • S(b);SBLOCK::R1(E)
        • S(b);SBLOCK::R1(F)
        • P(c);OGATEB::QAB(B)
      • Refutation
        • B(a);
    • Try
      • Q(B);N_PINS(b),XB(a)
      • Threat
        • DUALS(5)
      • Refutation
        • S(b);
    • Try
      • Q(B);CHECK,XS(b)
      • Refutation
        • P(c);XQ(B)
  • Actual
    • Q(B);N_PINS(b)
    • Vars
      • B(a);OGATE::QAB(B)
      • S(b);OGATE::QAB1(B)
      • S(b);N_GUARD,S_CUTB(a)::QAR2(B)
      • S(b);SBLOCK::R1(E)
      • S(b);SBLOCK::R1(F)
      • P(c);OGATEB::QAB(B)
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