MESON Chess Problem Database

Problem Display
PID: 89765 (8/8/K1R1Q1R1/1N2N3/4k3/8/4b2B/7q w - - 0 1)

Casa, Alex

Die Schwalbe, 1996

8/8/K1R1Q1R1/1N2N3/4k3/8/4b2B/7q

#2

7 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sd3+?
      • 1...Kf3
        • 2.Sd4#
        • 2.Rg3#
      • 1...Kxd3!
    • 1.Sf3+?
      • 1...Kd3
        • 2.Rc3#
      • 1...Kxf3!
    • 1.Sc4+?
      • 1...Kf3
        • 2.Qf5#
        • 2.Qe3#
      • 1...Kd3!
    • 1.Qc4+?
      • 1...Ke3
        • 2.Qd4#
        • 2.Qf4#
      • 1...Kf5
        • 2.Sd6#
        • 2.Rcf6#
        • 2.Qf4#
      • 1...Bxc4!
    • 1.Qg4+?
      • 1...Ke3
        • 2.Qd4#
        • 2.Qf4#
      • 1...Kd5
        • 2.Rgd6#
        • 2.Qd4#
      • 1...Bxg4!
    • 1.Qd5+?
      • 1...Ke3
        • 2.Qd4#
      • 1...Kf5
        • 2.Sf3#
        • 2.Rcf6#
      • 1...Kxd5!
    • 1.Qf5+?
      • 1...Ke3
        • 2.Qf4#
      • 1...Kd5
        • 2.Sd3#
        • 2.Sf3#
        • 2.Sc4#
        • 2.Sg4#
        • 2.Sd7#
        • 2.Sf7#
        • 2.Rgd6#
      • 1...Kxf5!
  • Keys
    • 1.Sg4+!
      • 1...Kd3
        • 2.Qe3#
      • 1...Kf3
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);CHECK,N_SPINS(B)
      • Refutation
        • K(c);S_FLIGHT,XS(C)
    • Try
      • S(C);CHECK
      • Vars
        • K(c);N_PINS(B),S_FLIGHT::R1(E)
      • Refutation
        • K(c);S_FLIGHT,XS(C)
    • Try
      • S(C);CHECK,N_SPINS(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(F);CHECK,N_SPINS(B)
      • Refutation
        • B(b);P_PINS(B),XQ(F)
    • Try
      • Q(F);CHECK
      • Refutation
        • B(b);N_PINS(B),XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB1(F)
      • Refutation
        • K(c);S_FLIGHT,XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB1(F)
      • Refutation
        • K(c);S_FLIGHT,XQ(F)
  • Actual
    • S(C);CHECK
    • Vars
      • K(c);N_PINS(B),OGATE,S_FLIGHT::QAR1(F)
      • K(c);S_FLIGHT::QAB(F)
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