MESON Chess Problem Database

Problem Display
PID: 43761 (Q7/R6B/3kNn1R/3P4/3p3p/1N4qp/1P4pB/1K2n3 w - - 0 1)

Waldi, V

De Problemist, 1930

Q7/R6B/3kNn1R/3P4/3p3p/1N4qp/1P4pB/1K2n3

#2

10 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Bxf4#
    • 1...Qe5
      • 2.Qc6#
  • Tries
    • 1.Sd2?
      • threat
        • 2.Sc4#
      • 1...Ke5
        • 2.Sc4#
      • 1...Sd7!
    • 1.Sa5?
      • threat
        • 2.Sc4#
      • 1...Ke5
        • 2.Sc4#
      • 1...Sd7!
    • 1.Rd7+?
      • 1...Ke5
        • 2.Qb8#
      • 1...Kxd7
        • 2.Qd8#
      • 1...Sxd7!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Qb8#
      • 1...Qd3+
        • 2.Sxd3#
      • 1...Qg6+
        • 2.Sxg6#
      • 1...Ke5
        • 2.Qb8#
      • 1...Qxf4
        • 2.Bxf4#
      • 1...Qxb3
        • 2.Sd3#
      • 1...Qc3
        • 2.Sd3#
      • 1...Qg7
        • 2.Sg6#
      • 1...Qg8
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • Q(c);OGATE::B(C),XQ(c)
    • Q(c);::QAR1(J)
  • Tries
    • Try
      • S(D);
      • Threat
        • S(D)
      • Vars
        • K(g);S_FLIGHT::S(D)
      • Refutation
        • S(h);
    • Try
      • S(D);
      • Threat
        • S(D)
      • Vars
        • K(g);S_FLIGHT::S(D)
      • Refutation
        • S(h);
    • Try
      • R(H);CHECK
      • Vars
        • K(g);S_FLIGHT::QAB(J)
        • K(g);N_SPINQ(c),P-FLIGHT,XR(H)::QAR1(J)
      • Refutation
        • S(h);XR(H)
  • Actual
    • S(F);N_PINQ(c),P_PINS(h)
    • Threat
      • QAB(J)
    • Vars
      • Q(c);CHECK::B(C)+S(F),XQ(c)
      • Q(c);CHECK,N_SPINS(h)::B(C)+S(F),XQ(c)
      • K(g);N_SPINS(h),S_FLIGHT::QAB(J)
      • Q(c);OGATE,P_SPINQ(c),XS(F)::B(C),XQ(c)
      • Q(c);P_PINP(B),XS(D)::B(C)+S(F)
      • Q(c);::B(C)+S(F)
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