MESON Chess Problem Database

Problem Display
PID: 81191 (5q2/1NQ5/1p1n4/3N4/1r2k1P1/2B2p2/3R1Kn1/8 w - - 0 1)

Casa, Alex

3rd Comm., Probleemblad, 1954

5q2/1NQ5/1p1n4/3N4/1r2k1P1/2B2p2/3R1Kn1/8

#2

7 + 7

5454 Near Snap 2015
133 The Problemist Supplement 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qe7
      • 2.Qxe7#
    • 1...Qg7
      • 2.Sxd6#
    • 1...Qf5
      • 2.Sxd6#
    • 1...Qf7
      • 2.Sxd6#
    • 1...Qa8
      • 2.Sxd6#
      • 2.Qe7#
    • 1...Qb8
      • 2.Sxd6#
      • 2.Qe7#
    • 1...Qc8
      • 2.Sxd6#
    • 1...Qe8
      • 2.Sxd6#
    • 1...Qg8
      • 2.Sxd6#
    • 1...Qh8
      • 2.Sxd6#
    • 1...Sc4
      • 2.Rd4#
    • 1...Sb5
      • 2.Qe5#
    • 1...Sf5
      • 2.Qe5#
    • 1...Sxb7
      • 2.Qe5#
    • 1...Sf7
      • 2.Sf6#
    • 1...Sc8
      • 2.Qe5#
    • 1...Se8
      • 2.Qe5#
    • 1...b5
      • 2.Sc5#
  • Tries
    • 1.Qxd6?
      • threat
        • 2.Qe5#
        • 2.Qe6#
      • 1...Qxd6
        • 2.Sxd6#
      • 1...Qh6
        • 2.Qxb4#
        • 2.Qe5#
      • 1...Qe7
        • 2.Qxe7#
        • 2.Qg6#
      • 1...Qf4
        • 2.Qxb4#
      • 1...Qf5
        • 2.Qxb4#
      • 1...Qf6
        • 2.Sxf6#
      • 1...Qf7
        • 2.Qxb4#
        • 2.Qe5#
      • 1...Qb8
        • 2.Sf6#
        • 2.Qxb4#
        • 2.Qg6#
      • 1...Qc8
        • 2.Sf6#
        • 2.Qe5#
      • 1...Qe8
        • 2.Sf6#
        • 2.Qxb4#
      • 1...Qg8
        • 2.Sf6#
        • 2.Qxb4#
        • 2.Qe5#
      • 1...Qh8
        • 2.Qg6#
      • 1...Rd4
        • 2.Rxd4#
        • 2.Qe6#
      • 1...Sf4
        • 2.Qe5#
      • 1...Qg7!
    • 1.Qh7+?
      • 1...Qf5
        • 2.Sxd6#
      • 1...Sf5!
  • Keys
    • 1.Qxb6!
      • threat
        • 2.Sc5#
      • 1...Sxb7
        • 2.Qe6#
      • 1...Rd4
        • 2.Qxd4#
      • 1...Qc8
        • 2.Sxd6#
      • 1...Rc4
        • 2.Qb1#
      • 1...Rb5
        • 2.Qd4#
      • 1...Sc4
        • 2.Qd4#
      • 1...Sb5
        • 2.Qe6#
      • 1...Sf5
        • 2.Qe6#
      • 1...Sf7
        • 2.Qg6#
      • 1...Sc8
        • 2.Qe6#
      • 1...Se8
        • 2.Qe6#

Anticipated by 90752(1949)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 7
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(g);N_GUARD::QAR(G),XQ(g)
    • Q(g);N_GUARD::S(F),XS(f)
    • S(f);S_CUTR(c)::R1(A)
    • S(f);OGATE::QAR1(G)
    • S(f);OGATE,XS(F)::QAR1(G)
    • S(f);S_CUTQ(g)::S(E)
    • P(e);N_GUARD::S(F)
  • Tries
    • Try
      • Q(G);XS(f)
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);XQ(G)::S(F),XQ(g)
        • Q(g);N_GUARD::QAR(G),XR(c)
        • Q(g);N_GUARD::S(E),XQ(g)
        • Q(g);N_GUARD::QAB(G)
        • S(a);::QAR1(G)
      • Refutation
        • Q(g);
    • Try
      • Q(G);CHECK
      • Vars
        • Q(g);P_SPINQ(g)::S(F),XS(f)
      • Refutation
        • S(f);P_SPINS(f)
  • Actual
    • Q(G);XP(e)
    • Threat
      • S(F)
    • Vars
      • S(f);OGATE,XS(F)::QAR2(G)
      • R(c);N_GUARD::QAR1(G),XR(c)
      • Q(g);N_GUARD::S(F),XS(f)
      • R(c);OGATE::QAB(G)
      • R(c);N_GUARD::QAR1(G)
      • S(f);S_CUTR(c)::QAR1(G)
      • S(f);OGATE::QAR2(G)
      • S(f);OGATE::QAB(G)
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