MESON Chess Problem Database

Problem Display
PID: 269222 (4Q3/8/8/3b4/3kN3/5p2/3K3B/8 w - - 0 1)

Petrasinovic, Petrasin

Comm., Sem Shakhmatnikh not, 2021

4Q3/8/8/3b4/3kN3/5p2/3K3B/8

#2

4 + 3

5454 Near Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qa4#
    • 1...Bc4
      • 2.Qe5#
  • Tries
    • 1.Bg1+?
      • 1...Kc4
        • 2.Qa4#
      • 1...f2!
    • 1.Be5+?
      • 1...Kc4
        • 2.Qa4#
      • 1...Kxe4!
    • 1.Qd7?
      • 1...Kc4
        • 2.Qa4#
      • 1...Kxe4
        • 2.Qg4#
      • 1...f2!
    • 1.Qh8+?
      • 1...Kxe4
        • 2.Qe5#
      • 1...Kc4!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qd3#
      • 1...Kxe4
        • 2.Qd3#
      • 1...Bxe4
        • 2.Be5#
      • 1...Bc4
        • 2.Qe5#

Anticipated by 241711(2013)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(b);P-FLIGHT,S_CUTB(c)::QAR2(D)
    • B(c);SBLOCK::QAB1(D)
  • Tries
    • Try
      • B(B);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT::QAR2(D)
      • Refutation
        • P(a);P_SPINP(a)
    • Try
      • B(B);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT::QAR2(D)
      • Refutation
        • K(b);P-FLIGHT,XS(C)
    • Try
      • Q(D);P_PINB(c)
      • Vars
        • K(b);N_SPINB(c),P-FLIGHT,S_CUTB(c)::QAR2(D)
        • K(b);N_SPINB(c),OGATEB,P-FLIGHT,XS(C)::QAR2(D)
      • Refutation
        • P(a);
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT,XS(C)::QAR1(D)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(D);
    • Threat
      • QAR1(D)
    • Vars
      • K(b);P-FLIGHT,XS(C)::QAB1(D)
      • B(c);SBLOCK,XS(C)::B(B)
      • B(c);OGATE,SBLOCK::QAB1(D)
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