MESON Chess Problem Database

Problem Display
PID: 229060 (1r6/3Q4/rp1n4/1Np5/k2Np3/8/K7/4B3 w - - 0 1)

Fenerov, A

64 Shakhmatnoe obozrenie, 1926

1r6/3Q4/rp1n4/1Np5/k2Np3/8/K7/4B3

#2

5 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ra7
      • 2.Qxa7#
    • 1...Sxb5
      • 2.Qxb5#
  • Tries
    • 1.Sa3+?
      • 1...Sb5
        • 2.Qxb5#
      • 1...b5!
    • 1.Sc3+?
      • 1...Ka5
        • 2.Sb1#
        • 2.Sd1#
        • 2.Sce2#
        • 2.Sa4#
        • 2.Sxe4#
        • 2.Sd5#
        • 2.Sc6#
        • 2.Qa4#
      • 1...Kb4+!
    • 1.Sa7+?
      • 1...Sb5
        • 2.Qxb5#
      • 1...b5!
    • 1.Sc7+?
      • 1...Sb5
        • 2.Qxb5#
      • 1...b5!
    • 1.Qh3?
      • threat
        • 2.Qa3#
        • 2.Qb3#
      • 1...Sxb5
        • 2.Qb3#
      • 1...cxd4
        • 2.Qb3#
      • 1...Sc4
        • 2.Qb3#
      • 1...c4
        • 2.Qa3#
      • 1...e3!
    • 1.Qe6?
      • threat
        • 2.Qb3#
      • 1...Sc4
        • 2.Qxc4#
      • 1...c4!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Sc3#
      • 1...Kxb5+
        • 2.Sa5#
      • 1...Sxb5
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(d);OGATEB::QAR(E),XR(d)
    • S(f);OGATE,P_SPINS(f),XS(D)::QAB1(E),XS(f)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::QAB1(E),XS(f)
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • S(D);CHECK
      • Refutation
        • K(a);CHECK,P-FLIGHT
    • Try
      • S(D);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::QAB1(E),XS(f)
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • S(D);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::QAB1(E),XS(f)
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • S(f);XS(D)::QAB1(E)
        • P(c);XS(C)::QAB1(E)
        • S(f);::QAB1(E)
        • P(c);::QAR1(E)
      • Refutation
        • P(b);
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • S(f);N_GUARD::QAR2(E),XS(f)
      • Refutation
        • P(c);
  • Actual
    • S(C);
    • Threat
      • S(D)
    • Vars
      • K(a);CHECK,S_FLIGHT,XS(D)::QAB(E)+S(C)
      • S(f);OGATE,SBLOCK,XS(D)::QAB(E)
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