MESON Chess Problem Database

Problem Display
PID: 176202 (8/1K6/2p5/pk6/2pQ4/8/2N5/8 w - - 0 1)

Killgus, Johannes

Schach-Echo, 1989

8/1K6/2p5/pk6/2pQ4/8/2N5/8

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ka4
      • 2.Qxc4#
    • 1...c3
      • 2.Sa3#
    • 1...a4
      • 2.Qb6#
    • 1...c5
      • 2.Qd7#
  • Tries
    • 1.Qb2+?
      • 1...Kc5
        • 2.Qe5#
      • 1...Ka4!
    • 1.Qc3?
      • 1...Ka4
        • 2.Qxc4#
      • 1...Kc5
        • 2.Qe5#
      • 1...a4
        • 2.Qb4#
      • 1...c5!
    • 1.Qc5+?
      • 1...Ka4
        • 2.Qxc4#
      • 1...Kxc5!
    • 1.Qe5+?
      • 1...c5
        • 2.Qe8#
      • 1...Ka4!
    • 1.Qe4?
      • threat
        • 2.Qxc6#
      • 1...Ka4
        • 2.Qxc4#
      • 1...Kc5
        • 2.Qxc6#
        • 2.Qe5#
      • 1...c5
        • 2.Qc6#
        • 2.Qe8#
      • 1...a4!
    • 1.Qd5+?
      • 1...Ka4
        • 2.Qxc4#
      • 1...c5
        • 2.Qc6#
        • 2.Qd7#
      • 1...cxd5!
    • 1.Qd6?
      • threat
        • 2.Qxc6#
      • 1...a4
        • 2.Qb4#
      • 1...c5
        • 2.Qc6#
        • 2.Qd7#
      • 1...Ka4!
  • Keys
    • 1.Ka7!
      • 1...Ka4
        • 2.Qxc4#
      • 1...c5
        • 2.Qd7#
      • 1...c3
        • 2.Sa3#
      • 1...a4
        • 2.Qb6#

FEATURES

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