MESON Chess Problem Database

Problem Display
PID: 71670 (Q1n5/b4B2/8/8/4p3/8/8/k1K5 w - - 0 1)

Gugel, Lev Nikolaevich

Die Schwalbe, 1931

Q1n5/b4B2/8/8/4p3/8/8/k1K5

#2

3 + 4

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Sb6
      • 2.Qh8#
    • 1...Sd6
      • 2.Qxa7#
    • 1...Se7
      • 2.Qxa7#
  • Tries
    • 1.Bb3?
      • 1...Sb6
        • 2.Qh8#
      • 1...Sd6
        • 2.Qxa7#
      • 1...Se7
        • 2.Qxa7#
      • 1...e3!
    • 1.Bc4?
      • 1...Sb6
        • 2.Qh8#
      • 1...Sd6
        • 2.Qxa7#
      • 1...Se7
        • 2.Qxa7#
      • 1...e3!
    • 1.Bd5?
      • 1...Sb6
        • 2.Qh8#
      • 1...Sd6
        • 2.Qxa7#
      • 1...Se7
        • 2.Qxa7#
      • 1...e3!
    • 1.Be6?
      • 1...Sb6
        • 2.Qh8#
      • 1...Sd6
        • 2.Qxa7#
      • 1...Se7
        • 2.Qxa7#
      • 1...e3!
    • 1.Qxe4?
      • threat
        • 2.Qb1#
        • 2.Qa4#
      • 1...Bd4
        • 2.Qb1#
        • 2.Qxd4#
      • 1...Bc5
        • 2.Qb1#
      • 1...Sb6
        • 2.Qb1#
        • 2.Qd4#
        • 2.Qe5#
      • 1...Be3+!
    • 1.Qd5?
      • threat
        • 2.Qa2#
        • 2.Qa5#
      • 1...Bc5
        • 2.Qa2#
      • 1...Bb6
        • 2.Qa2#
      • 1...Sb6
        • 2.Qa2#
        • 2.Qd4#
        • 2.Qe5#
      • 1...Be3+!
  • Keys
    • 1.Kc2!
      • 1...Sb6
        • 2.Qh8#
      • 1...Sd6
        • 2.Qxa7#
      • 1...Se7
        • 2.Qxa7#
      • 1...e3
        • 2.Qh1#

Anticipated by 22047(1923), 22054(1924), 203312(1924), 81448(1929)

This anticipates 79539(1947), 150450(1948)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(d);OGATE::QAB(C)
    • S(d);N_GUARD::QAR(C),XB(c)
  • Tries
    • Try
      • B(B);
      • Vars
        • S(d);OGATE::QAB(C)
        • S(d);N_GUARD::QAR(C),XB(c)
      • Refutation
        • P(b);
    • Try
      • B(B);
      • Vars
        • S(d);OGATE::QAB(C)
        • S(d);N_GUARD::QAR(C),XB(c)
      • Refutation
        • P(b);
    • Try
      • B(B);
      • Vars
        • S(d);OGATE::QAB(C)
        • S(d);N_GUARD::QAR(C),XB(c)
      • Refutation
        • P(b);
    • Try
      • B(B);
      • Vars
        • S(d);OGATE::QAB(C)
        • S(d);N_GUARD::QAR(C),XB(c)
      • Refutation
        • P(b);
    • Try
      • Q(C);N_PINB(c),XP(b)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);::QAR1(C)
      • Refutation
        • B(c);CHECK
    • Try
      • Q(C);N_PINB(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);::QAR1(C)
      • Refutation
        • B(c);CHECK
  • Actual
    • K(A);P-FLIGHT
    • Vars
      • S(d);OGATE::QAB(C)
      • S(d);N_GUARD::QAR(C),XB(c)
      • P(b);OGATE::QAB1(C)
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