MESON Chess Problem Database

Problem Display
PID: 271048 (1n6/2p5/5R1n/3k4/K1N1NP2/3pP3/6Q1/8 w - - 0 1)

Boersma, Kornelis Thomas

Schakend Nederland, 1968

1n6/2p5/5R1n/3k4/K1N1NP2/3pP3/6Q1/8

#2

7 + 5

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc4
      • 2.Qa2#
    • 1...c5
      • 2.Sb6#
      • 2.Sed2#
      • 2.Sed6#
    • 1...c6
      • 2.Sb6#
  • Tries
    • 1.Kb5?
      • threat
        • 2.Sed2#
        • 2.Sf2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sed6#
      • 1...d2
        • 2.Sexd2#
        • 2.Sf2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sed6#
      • 1...c5
        • 2.Sb6#
        • 2.Sed2#
        • 2.Sf2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sxc5#
        • 2.Sg5#
        • 2.Sed6#
        • 2.Rd6#
      • 1...c6+!
    • 1.Sc3+?
      • 1...Kc5
        • 2.Qd5#
      • 1...Kxc4!
    • 1.Rd6+?
      • 1...Kxc4
        • 2.Rd4#
        • 2.Qa2#
      • 1...cxd6!
    • 1.Qg5+?
      • 1...Kxc4
        • 2.Qb5#
        • 2.Qc5#
      • 1...Kxe4
        • 2.Qg2#
      • 1...Sf5!
  • Keys
    • 1.Qa2!
      • threat
        • 2.Scd2#
      • 1...Kxe4
        • 2.Qg2#
      • 1...d2
        • 2.Scxd2#
      • 1...c5
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • K(b);OGATEB,S_FLIGHT,XS(D)::QAB(A)
    • P(d);N_GUARD::S(D)
  • Tries
    • Try
      • K(C);S_FLIGHT
      • Threat
        • DUALS(7)
      • Refutation
        • P(d);CHECK
    • Try
      • S(E);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);S_FLIGHT,XS(D)
    • Try
      • R(G);CHECK
      • Refutation
        • P(d);XR(G)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);OGATEB,S_FLIGHT,XS(E)::QAB(A)
      • Refutation
        • S(c);P_SPINS(c)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+S(D)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XS(E)::QAB(A)
      • P(a);::QAB(A)+S(D),XP(a)
      • P(d);SBLOCK::S(E)
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