MESON Chess Problem Database

Problem Display
PID: 224151 (Q7/3N4/1R1N4/8/2pkp3/3p4/8/6K1 w - - 0 1)

Paalanen, Erkki

Suomen Shakki, 1958

Q7/3N4/1R1N4/8/2pkp3/3p4/8/6K1

#2

5 + 4

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...c3
      • 2.Qxe4#
    • 1...e3
      • 2.Sb5#
  • Tries
    • 1.Rb2?
      • 1...Kc3
        • 2.Qh8#
      • 1...Ke3
        • 2.Qxe4#
      • 1...c3
        • 2.Qxe4#
      • 1...e3
        • 2.Sb5#
      • 1...d2!
    • 1.Qa5?
      • threat
        • 2.Sf5#
      • 1...d2
        • 2.Qxd2#
      • 1...c3
        • 2.Qc5#
      • 1...e3
        • 2.Qe5#
      • 1...Ke3!
    • 1.Qh8+?
      • 1...Kd5
        • 2.Qe5#
      • 1...Ke3!
  • Keys
    • 1.Qa2!
      • 1...Kc3
        • 2.Qb2#
      • 1...Ke3
        • 2.Qf2#
      • 1...Kd5
        • 2.Qxc4#
      • 1...d2
        • 2.Qxd2#
      • 1...c3
        • 2.Sf5#
      • 1...e3
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::QAR1(E),XP(d)
    • P(d);SBLOCK::S(C)
  • Tries
    • Try
      • R(B);
      • Vars
        • K(c);S_FLIGHT::QAB(E)
        • K(c);S_FLIGHT::QAR1(E),XP(d)
        • P(b);SBLOCK::QAR1(E),XP(d)
        • P(d);SBLOCK::S(C)
      • Refutation
        • P(a);
    • Try
      • Q(E);
      • Threat
        • S(C)
      • Vars
        • P(a);OGATEB::QAR2(E),XP(a)
        • P(b);::QAB1(E)
        • P(d);::QAB1(E)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(E)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(c);S_FLIGHT::QAB1(E)
      • K(c);P-FLIGHT,P_SPINP(b)::QAB1(E),XP(b)
      • P(a);OGATEB::QAR2(E),XP(a)
      • P(b);SBLOCK::S(C)
      • P(d);SBLOCK::QAR1(E),XP(b)
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