MESON Chess Problem Database

Problem Display
PID: 80339 (8/6B1/2rpn3/1Q1N4/1b2k1P1/1BpnN1K1/8/8 w - - 0 1)

Koldijk, Albert Marinus

Nieuwe Apeldoornsche Courant, 1936

8/6B1/2rpn3/1Q1N4/1b2k1P1/1BpnN1K1/8/8

#2

7 + 7

5227 Schaak..., maar raak! 1969
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sc5
      • 2.Qc4#
  • Tries
    • 1.Sc2?
      • threat
        • 2.Sf6#
      • 1...Bc5
        • 2.Sxc3#
      • 1...Sdc5
        • 2.Qe2#
      • 1...Sec5
        • 2.Qc4#
      • 1...Rc5!
    • 1.Sf6+?
      • 1...Kd4
        • 2.Sc2#
        • 2.Sf5#
      • 1...Kxe3!
    • 1.Qc4+?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Rxc4!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Sf6#
      • 1...Rc5
        • 2.Sxd6#
      • 1...Bc5
        • 2.Sxc3#
      • 1...Sdc5
        • 2.Qe2#
      • 1...Sec5
        • 2.Qc4#

This anticipates 257610(2021)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(g);N_GUARD,S_CUTR(e)::QAR2(E)
  • Tries
    • Try
      • S(B);
      • Threat
        • S(F)
      • Vars
        • B(c);N_GUARD,S_CUTR(e)::S(F),XP(a)
        • S(b);OGATE::QAR2(E)
        • S(g);N_GUARD,S_CUTR(e)::QAR2(E)
      • Refutation
        • R(e);
    • Try
      • S(F);CHECK
      • Refutation
        • K(d);P-FLIGHT,XS(B)
    • Try
      • Q(E);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAR1(E),XS(g)
      • Refutation
        • R(e);XQ(E)
  • Actual
    • S(B);
    • Threat
      • S(F)
    • Vars
      • R(e);N_GUARD,S_CUTB(c)::S(B),XP(f)
      • B(c);N_GUARD,S_CUTR(e)::S(F),XP(a)
      • S(b);OGATE::QAR2(E)
      • S(g);N_GUARD,S_CUTR(e)::QAR2(E)
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