MESON Chess Problem Database

Problem Display
PID: 121447 (8/5N2/8/7K/4kp2/8/1N1Q4/2n5 w - - 0 1)

Mazel, Frantisek

Straz lidu, 1959

8/5N2/8/7K/4kp2/8/1N1Q4/2n5

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.Qd3#
    • 1...Se2
      • 2.Qd3#
    • 1...Sb3
      • 2.Qd3#
    • 1...Sd3
      • 2.Qxd3#
  • Tries
    • 1.Kg4?
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sa2
        • 2.Qd3#
      • 1...Se2
        • 2.Qd3#
      • 1...Sb3
        • 2.Qd3#
      • 1...f3!
    • 1.Qxf4+?
      • 1...Kd5
        • 2.Qc4#
      • 1...Kxf4!
    • 1.Qe2+?
      • 1...Kd4
        • 2.Qe5#
      • 1...Kd5
        • 2.Qc4#
      • 1...Kf5
        • 2.Qe5#
      • 1...Sxe2!
  • Keys
    • 1.Qc3!
      • 1...Kd5
        • 2.Qc4#
      • 1...Kf5
        • 2.Qe5#
      • 1...Sd3
        • 2.Qxd3#
      • 1...f3
        • 2.Qe5#
      • 1...Sa2
        • 2.Qd3#
      • 1...Se2
        • 2.Qd3#
      • 1...Sb3
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
  • Tries
    • Try
      • K(C);S_FLIGHT
      • Vars
        • S(a);N_GUARD::QAB1(B),XS(a)
        • S(a);N_GUARD::QAB1(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);CHECK,XP(c)
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(B)
      • Refutation
        • K(b);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT::QAB1(B)
        • K(b);S_FLIGHT::QAB1(B)
        • K(b);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • S(a);XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(b);S_FLIGHT::QAB1(B)
      • K(b);S_FLIGHT::QAR1(B)
      • S(a);N_GUARD::QAB1(B),XS(a)
      • P(c);SBLOCK::QAR1(B)
      • S(a);N_GUARD::QAB1(B)
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