MESON Chess Problem Database

Problem Display
PID: 240519 (8/8/1K6/p7/1p1Q4/k7/N7/2N5 w - - 0 1)

Pilchenko, Viacheslav Karlovich

Problemist Ukraini, 2015

8/8/1K6/p7/1p1Q4/k7/N7/2N5

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...a4
      • 2.Qxb4#
  • Tries
    • 1.Kb5?
      • 1...a4
        • 2.Qxb4#
      • 1...b3!
    • 1.Qa1?
      • threat
        • 2.Sc3#
      • 1...Ka4
        • 2.Sc3#
      • 1...b3!
    • 1.Qb2+?
      • 1...Ka4
        • 2.Qb3#
      • 1...Kxb2!
    • 1.Qc3+?
      • 1...Ka4
        • 2.Qb3#
      • 1...b3
        • 2.Qxb3#
      • 1...bxc3!
    • 1.Qe3+?
      • 1...Ka4
        • 2.Qb3#
      • 1...b3
        • 2.Qxb3#
      • 1...Kb2!
    • 1.Qc5?
      • 1...Ka4
        • 2.Qxa5#
      • 1...a4
        • 2.Qxb4#
      • 1...Kb2!
    • 1.Qd3+?
      • 1...Ka4
        • 2.Qb3#
      • 1...b3
        • 2.Qxb3#
      • 1...Kb2!
    • 1.Qc4?
      • threat
        • 2.Qb3#
      • 1...Ka4
        • 2.Qb3#
      • 1...b3
        • 2.Qxb3#
      • 1...a4
        • 2.Qxb4#
      • 1...Kb2!
  • Keys
    • 1.Sxb4!
      • threat
        • 2.Sc2#
      • 1...Ka4
        • 2.Sc2#
      • 1...axb4
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(c);N_GUARD::QAB1(C),XP(b)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • P(c);N_GUARD::QAB1(C),XP(b)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • QAR(C)+S(B)
      • Vars
        • K(a);P-FLIGHT::QAR(C)+S(B),DCHECK
      • Refutation
        • P(b);
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(C)
      • Refutation
        • K(a);S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(C)
        • P(b);P_SPINP(b)::QAR1(C),XP(b)
      • Refutation
        • P(b);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(C)
        • P(b);P_SPINP(b)::QAR1(C),XP(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(C),XP(c)
        • P(c);N_GUARD::QAB1(C),XP(b)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(C)
        • P(b);P_SPINP(b)::QAR1(C),XP(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT,P_SPINP(b)::QAB1(C)
        • P(b);::QAR1(C),XP(b)
        • P(c);N_GUARD::QAB1(C),XP(b)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(B);XP(b)
    • Threat
      • S(B)
    • Vars
      • K(a);P-FLIGHT::QAR(C)+S(B)
      • P(c);SBLOCK,XS(B)::QAR2(C)
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