MESON Chess Problem Database

Problem Display
PID: 120007 (3QBK2/p7/P7/P7/1kp1P3/8/8/B7 w - - 0 1)

Dehler, Ernst Georg

Deutsche Schachzeitung, 1913

3QBK2/p7/P7/P7/1kp1P3/8/8/B7

#2

7 + 3

6490 yacpdb 2009
15148 Sadier Collection 2014
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qe7#
  • Tries
    • 1.Qb6+?
      • 1...Ka3
        • 2.Qb2#
      • 1...axb6!
    • 1.Qd2+?
      • 1...Ka3
        • 2.Qb2#
      • 1...Kb3
        • 2.Qb2#
      • 1...c3
        • 2.Qxc3#
      • 1...Kc5!
    • 1.Qd4?
      • 1...Ka3
        • 2.Qb2#
      • 1...Kb3
        • 2.Qb2#
      • 1...Kxa5!
    • 1.Qd6+?
      • 1...Kxa5
        • 2.Bc3#
      • 1...Kb3!
    • 1.Qd7?
      • 1...Ka3
        • 2.Qa4#
      • 1...Kb3
        • 2.Qa4#
      • 1...Kxa5
        • 2.Qb5#
      • 1...Kc5
        • 2.Qe7#
      • 1...c3!
    • 1.Qb8+?
      • 1...Ka3
        • 2.Qb2#
      • 1...Kxa5
        • 2.Qb5#
      • 1...Kc5!
  • Keys
    • 1.Qf6!
      • 1...Ka3
        • 2.Qb2#
      • 1...Kb3
        • 2.Qb2#
      • 1...Kxa5
        • 2.Bc3#
      • 1...Kc5
        • 2.Qe7#
      • 1...c3
        • 2.Qxc3#

Anticipated by 121470(1910)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAB(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(E)
      • Refutation
        • P(c);XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
        • K(a);P-FLIGHT::QAR1(E)
        • P(b);P_SPINP(b)::QAB1(E),XP(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB1(E)
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(E)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT,XP(C)
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT,XP(C)::B(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT::QAR1(E)
        • K(a);P-FLIGHT::QAB1(E)
        • K(a);S_FLIGHT,XP(C)::QAR1(E)
        • K(a);S_FLIGHT::QAB(E)
      • Refutation
        • P(b);
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(E)
        • K(a);S_FLIGHT,XP(C)::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(a);S_FLIGHT::QAB1(E)
      • K(a);P-FLIGHT::QAR1(E)
      • K(a);S_FLIGHT,XP(C)::B(A)
      • K(a);S_FLIGHT::QAB(E)
      • P(b);::QAB1(E),XP(b)
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