MESON Chess Problem Database

Problem Display
PID: 180941 (4N3/8/4p3/3k4/1QN5/8/4K3/8 w - - 0 1)

Grassano, Carlos A

Problem Observer, 2013

4N3/8/4p3/3k4/1QN5/8/4K3/8

#2

4 + 2

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Kd3?
      • threat
        • 2.Qd6#
        • 2.Qb5#
      • 1...e5
        • 2.Qd6#
      • 1...Kc6!
    • 1.Sd2?
      • threat
        • 2.Qd6#
      • 1...Ke5
        • 2.Qe4#
      • 1...Kc6!
    • 1.Sa3?
      • 1...Kc6
        • 2.Qb5#
      • 1...e5
        • 2.Qc4#
      • 1...Ke5!
    • 1.Sa5?
      • 1...e5
        • 2.Sc7#
        • 2.Qc4#
      • 1...Ke5!
    • 1.Sf6+?
      • 1...Kc6
        • 2.Qb6#
      • 1...Kd4!
    • 1.Qc5+?
      • 1...Ke4
        • 2.Qe5#
      • 1...Kxc5!
    • 1.Qd6+?
      • 1...Ke4
        • 2.Qe5#
      • 1...Kxc4!
    • 1.Qb5+?
      • 1...Ke4
        • 2.Qe5#
      • 1...Kd4!
  • Keys
    • 1.Scd6!
      • 1...Ke5
        • 2.Qe4#
      • 1...Kc6
        • 2.Qb5#
      • 1...e5
        • 2.Qc4#

This anticipates 202704(2015)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(C);
      • Threat
        • QAR1(B)
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(C);
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
        • P(b);SBLOCK::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(C);
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(D);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(C);
    • Vars
      • K(a);P-FLIGHT::QAR1(B)
      • K(a);S_FLIGHT::QAB1(B)
      • P(b);SBLOCK::QAB1(B)
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