MESON Chess Problem Database

Problem Display
PID: 263145 (8/7Q/8/N1K5/k1p5/P7/8/8 w - - 0 1)

Alekseev, Yuri Mikhailovich

Nagovitsin, Eduard Nikolaevich

HM., SuperProblem, 2021

8/7Q/8/N1K5/k1p5/P7/8/8

#2

4 + 2

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa5
      • 2.Qa7#
  • Tries
    • 1.Kxc4?
      • 1...Kxa5
        • 2.Qa7#
      • 1...Kxa3!
    • 1.Qc2+?
      • 1...Kxa3
        • 2.Sxc4#
      • 1...Kxa5!
    • 1.Qe4?
      • 1...Kxa5
        • 2.Qa8#
      • 1...Kxa3!
    • 1.Qh1?
      • 1...Kxa3
        • 2.Qa1#
      • 1...Kxa5
        • 2.Qa8#
      • 1...c3!
    • 1.Qb7?
      • threat
        • 2.Qb4#
      • 1...Kxa5
        • 2.Qa8#
        • 2.Qb5#
        • 2.Qa7#
      • 1...Kxa3!
    • 1.Qd7+?
      • 1...Kxa5
        • 2.Qb5#
        • 2.Qa7#
      • 1...Kxa3!
    • 1.Qg7?
      • 1...Kxa3
        • 2.Qa1#
      • 1...Kxa5
        • 2.Qa7#
      • 1...c3!
    • 1.Qh8?
      • 1...Kxa3
        • 2.Qa1#
      • 1...Kxa5
        • 2.Qa8#
      • 1...c3!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Qb4#
      • 1...Kxa3
        • 2.Qa1#
      • 1...Kxa5
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);OGATEB,P-FLIGHT,XS(B)::QAR2(D)
  • Tries
    • Try
      • K(C);P-FLIGHT,XP(b)
      • Vars
        • K(a);OGATEB,P-FLIGHT,XS(B)::QAR2(D)
      • Refutation
        • K(a);P-FLIGHT,XP(A)
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);P-FLIGHT,XP(A)::S(B),XP(b)
      • Refutation
        • K(a);P-FLIGHT,XS(B)
    • Try
      • Q(D);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),OGATEB,P-FLIGHT,XS(B)::QAR(D)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT,XP(A)
    • Try
      • Q(D);
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(A)::QAR2(D)
        • K(a);OGATEB,P-FLIGHT,XS(B)::QAR(D)
      • Refutation
        • P(b);
    • Try
      • Q(D);
      • Threat
        • QAR1(D)
      • Refutation
        • K(a);P-FLIGHT,XP(A)
    • Try
      • Q(D);CHECK
      • Refutation
        • K(a);P-FLIGHT,XP(A)
    • Try
      • Q(D);
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(A)::QAR2(D)
        • K(a);OGATEB,P-FLIGHT,XS(B)::QAR2(D)
      • Refutation
        • P(b);
    • Try
      • Q(D);
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(A)::QAR2(D)
        • K(a);OGATEB,P-FLIGHT,XS(B)::QAR(D)
      • Refutation
        • P(b);
  • Actual
    • Q(D);
    • Threat
      • QAR1(D)
    • Vars
      • K(a);OGATEB,P-FLIGHT,XP(A)::QAR2(D)
      • K(a);N_GUARD,P-FLIGHT,XS(B)::QAR1(D)
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