MESON Chess Problem Database

Problem Display
PID: 121287 (8/8/B2n4/p1B4K/k7/4PQ2/1pp5/3N4 w - - 0 1)

Maximov, Nikolai J

Offiziers Schachzeitung, 1905

8/8/B2n4/p1B4K/k7/4PQ2/1pp5/3N4

#2

6 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...cxd1Q
      • 2.Qxd1#
    • 1...cxd1S
      • 2.Qxd1#
    • 1...cxd1B
      • 2.Qxd1#
    • 1...cxd1R
      • 2.Qxd1#
  • Tries
    • 1.Qc6+?
      • 1...Sb5
        • 2.Qxb5#
      • 1...Kb3!
    • 1.e4?
      • threat
        • 2.Sxb2#
        • 2.Qa3#
      • 1...cxd1Q
        • 2.Qxd1#
      • 1...cxd1S
        • 2.Qxd1#
        • 2.Qa3#
      • 1...cxd1B
        • 2.Qxd1#
      • 1...cxd1R
        • 2.Qxd1#
        • 2.Qa3#
      • 1...b1Q
        • 2.Qa3#
      • 1...b1S
        • 2.Sb2#
      • 1...b1B
        • 2.Sb2#
        • 2.Qa3#
      • 1...b1R
        • 2.Qa3#
      • 1...c1Q
        • 2.Qa3#
      • 1...c1B
        • 2.Qa3#
      • 1...Sb5
        • 2.Sxb2#
      • 1...Sc4!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Sxb2#
        • 2.Sc3#
        • 2.Qa2#
      • 1...cxd1Q+
        • 2.Qxd1#
      • 1...cxd1B+
        • 2.Qxd1#
      • 1...cxd1S
        • 2.Qa2#
        • 2.Qxd1#
      • 1...cxd1R
        • 2.Qa2#
        • 2.Qxd1#
      • 1...Sc4
        • 2.Qxc4#
      • 1...b1Q
        • 2.Sc3#
      • 1...b1S
        • 2.Sb2#
      • 1...b1B
        • 2.Sb2#
        • 2.Sc3#
      • 1...b1R
        • 2.Sc3#
        • 2.Qa2#
      • 1...c1Q
        • 2.Qa2#
      • 1...c1S
        • 2.Sxb2#
        • 2.Sc3#
      • 1...c1B
        • 2.Sc3#
        • 2.Qa2#
      • 1...c1R
        • 2.Sxb2#
        • 2.Qa2#
      • 1...Se4
        • 2.Sxb2#
        • 2.Qa2#
        • 2.Qc4#
      • 1...Sb5
        • 2.Sxb2#
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • P(b);OGATE,P_PINQ(C),XS(A)::QAB(C),XQ(b)
    • P(b);OGATE,XS(A)::QAB(C),XS(b)
    • P(b);OGATE,P_PINQ(C),XS(A)::QAB(C),XB(b)
    • P(b);OGATE,XS(A)::QAB(C),XR(b)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAB1(C),XS(e)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • P(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);OGATE,P_PINQ(C),XS(A)::QAB(C),XQ(b)
        • P(b);OGATE,P_PINQ(C),XS(A)::QAB(C),XB(b)
        • P(a);::QAR1(C)
        • P(a);::S(A)
        • P(b);::QAR1(C)
        • S(e);::S(A),XP(a)
      • Refutation
        • S(e);
  • Actual
    • Q(C);
    • Threat
      • DUALS(3)
    • Vars
      • P(b);CHECK,OGATE,XS(A)::QAB(C),XQ(b)
      • P(b);CHECK,OGATE,XS(A)::QAB(C),XB(b)
      • S(e);N_GUARD::QAR2(C),XS(e)
      • P(a);::S(A)
      • P(b);::QAR2(C)
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