MESON Chess Problem Database

Problem Display
PID: 101047 (2Q5/1n6/8/6K1/1Nnkp2R/3N2R1/7B/b7 w - - 0 1)

Koetsheid, Petrus Albertus

Good Companions, 1919

2Q5/1n6/8/6K1/1Nnkp2R/3N2R1/7B/b7

#2

7 + 5

6490 yacpdb 2009
5454 Near Snap 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.Bg1#
    • 1...Sd2
      • 2.Bg1#
    • 1...Sa3
      • 2.Bg1#
    • 1...Sca5
      • 2.Bg1#
    • 1...Se5
      • 2.Bg1#
    • 1...Sb6
      • 2.Bg1#
    • 1...Scd6
      • 2.Bg1#
  • Tries
    • 1.Se1?
      • threat
        • 2.Rd3#
      • 1...Ke5
        • 2.Rd3#
      • 1...Sb2
        • 2.Qc3#
      • 1...Se3
        • 2.Sf3#
      • 1...Se5
        • 2.Sec2#
        • 2.Bg1#
      • 1...Sc5!
    • 1.Sf2?
      • threat
        • 2.Rd3#
        • 2.Rxe4#
      • 1...Ke5
        • 2.Rd3#
      • 1...Sb2
        • 2.Rxe4#
        • 2.Qc3#
      • 1...Sd2
        • 2.Rd3#
      • 1...Se3
        • 2.Rxe4#
      • 1...Se5
        • 2.Rxe4#
      • 1...Scd6
        • 2.Rd3#
      • 1...Sbd6
        • 2.Rd3#
      • 1...Sc5!
    • 1.Bg1+?
      • 1...Se3
        • 2.Bxe3#
      • 1...Kc3!
    • 1.Rxe4+?
      • 1...Kxe4
        • 2.Qg4#
      • 1...Kc3!
  • Keys
    • 1.Se5!
      • threat
        • 2.Rd3#
      • 1...Kxe5
        • 2.Rd3#
      • 1...Sxe5
        • 2.Bg1#
      • 1...Sb2
        • 2.Qc3#
      • 1...Se3
        • 2.Sf3#
      • 1...Sc5
        • 2.Sec6#

This anticipates 150673(1933)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(b);N_GUARD::B(A)
  • Tries
    • Try
      • S(B);
      • Threat
        • R1(C)
      • Vars
        • K(c);N_SPINP(d),S_FLIGHT::B(A)+R(C)
        • S(b);OGATE::QAB1(G)
        • S(b);SBLOCK::S(B)
      • Refutation
        • S(e);
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);N_SPINP(d),S_FLIGHT::B(A)+R(C)
        • S(b);::R1(C)
        • S(b);::R1(E),XP(d)
        • S(e);::R1(C)
      • Refutation
        • S(e);
    • Try
      • B(A);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::B(A),XS(b)
      • Refutation
        • K(c);N_SPINP(d),P_SPINS(b),S_FLIGHT
    • Try
      • R(E);CHECK,XP(d)
      • Vars
        • K(c);P-FLIGHT,XR(E)::QAR2(G)
      • Refutation
        • K(c);P_SPINS(b),S_FLIGHT
  • Actual
    • S(B);
    • Threat
      • R1(C)
    • Vars
      • K(c);N_SPINP(d),S_FLIGHT,XS(B)::B(A)+R(C)
      • S(b);N_GUARD,SBLOCK,XS(B)::B(A)
      • S(b);OGATE::QAB1(G)
      • S(b);SBLOCK::S(B)
      • S(e);SBLOCK::S(B)
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