MESON Chess Problem Database

Problem Display
PID: 85723 (8/1kN2R2/1p3Q2/8/1K6/6r1/8/8 w - - 0 1)

Speckmann, Werner

Skakbladet TT, 1961

8/1kN2R2/1p3Q2/8/1K6/6r1/8/8

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sb5+?
      • 1...Ka6
        • 2.Ra7#
      • 1...Ka8
        • 2.Qd8#
      • 1...Kb8
        • 2.Qd8#
      • 1...Kc8!
    • 1.Sd5+?
      • 1...Ka6
        • 2.Qxb6#
      • 1...Ka8
        • 2.Qd8#
      • 1...Kb8
        • 2.Qd8#
      • 1...Kc8!
    • 1.Sa6+?
      • 1...Ka8
        • 2.Qd8#
        • 2.Qc6#
      • 1...Kc8
        • 2.Rc7#
      • 1...Kxa6!
    • 1.Sa8+?
      • 1...Ka6
        • 2.Qxb6#
      • 1...Kxa8
        • 2.Qd8#
      • 1...Kb8
        • 2.Qd8#
      • 1...Kc8!
    • 1.Qf3+?
      • 1...Ka7
        • 2.Qa8#
      • 1...Kb8
        • 2.Qa8#
      • 1...Kc8
        • 2.Qa8#
      • 1...Rxf3!
    • 1.Qc6+?
      • 1...Ka7
        • 2.Qa8#
      • 1...Kb8
        • 2.Sa6#
        • 2.Qa8#
      • 1...Kc8
        • 2.Rf8#
        • 2.Qa8#
      • 1...Kxc6!
  • Keys
    • 1.Se6+!
      • 1...Ka6
        • 2.Sc5#
      • 1...Kc6
        • 2.Sf4#
      • 1...Ka8
        • 2.Qd8#
      • 1...Kb8
        • 2.Qd8#
      • 1...Kc8
        • 2.Qd8#

This is a version of 234506

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(c);OGATE,P_SPINP(b),S_FLIGHT::R1(D)
        • K(c);S_FLIGHT::QAR(B)
        • K(c);P-FLIGHT::QAR2(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(C);CHECK
      • Vars
        • K(c);P_SPINP(b),S_FLIGHT::QAR1(B),XP(b)
        • K(c);S_FLIGHT::QAR(B)
        • K(c);P-FLIGHT::QAR2(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(C);CHECK
      • Vars
        • K(c);S_FLIGHT::R1(D)
      • Refutation
        • K(c);P_SPINP(b),S_FLIGHT,XS(C)
    • Try
      • S(C);CHECK
      • Vars
        • K(c);P_SPINP(b),S_FLIGHT::QAR1(B),XP(b)
        • K(c);S_FLIGHT,XS(C)::QAR(B)
        • K(c);P-FLIGHT::QAR2(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);OGATE,P-FLIGHT::QAR1(B)
        • K(c);OGATE,S_FLIGHT::QAR2(B)
      • Refutation
        • R(a);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);OGATE,P-FLIGHT::QAR1(B)
      • Refutation
        • K(c);S_FLIGHT,XQ(B)
  • Actual
    • S(C);CHECK
    • Vars
      • K(c);S_FLIGHT::S(C)
      • K(c);S_FLIGHT::QAR(B)+S(C)
      • K(c);S_FLIGHT::QAR(B)
      • K(c);P-FLIGHT::QAR2(B)
      • K(c);S_FLIGHT::QAR1(B)
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