MESON Chess Problem Database

Problem Display
PID: 235446 (6r1/6Q1/8/1N2p3/pp3p1B/R2Bk1nR/4prp1/KN3b2 w - - 0 1)

Pituk, Alexander

Source?, 1998

6r1/6Q1/8/1N2p3/pp3p1B/R2Bk1nR/4prp1/KN3b2

#2

8 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rf3
      • 2.Qa7#
    • 1...f3
      • 2.Bg5#
  • Tries
    • 1.Rxg3+?
      • 1...Rf3
        • 2.Qa7#
      • 1...f3
        • 2.Bg5#
        • 2.Qxe5#
      • 1...fxg3!
    • 1.Qg6?
      • threat
        • 2.Qe4#
      • 1...Kf3
        • 2.Be4#
      • 1...Rf3
        • 2.Qb6#
      • 1...f3
        • 2.Bg5#
      • 1...e4
        • 2.Qxe4#
      • 1...Rxg6!
    • 1.Qb7?
      • threat
        • 2.Qe4#
      • 1...Rf3
        • 2.Qb6#
        • 2.Qa7#
      • 1...e4
        • 2.Qxe4#
      • 1...f3!
  • Keys
    • 1.Qxe5+!
      • 1...Kf3
        • 2.Bxe2#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(c);N_SPINS(f),SBLOCK::QAB(H)
    • P(i);N_SPINS(f),OGATEB,SBLOCK::B(F)
  • Tries
    • Try
      • R(E);CHECK,XS(f)
      • Vars
        • R(c);P_SPINR(c)::QAB(H)
      • Refutation
        • P(i);XR(E)
    • Try
      • Q(H);
      • Threat
        • QAR1(H)
      • Vars
        • K(e);P-FLIGHT::R(C)+B(D),DCHECK
        • R(c);N_SPINS(f),SBLOCK::QAB(H)
        • P(i);N_SPINS(f),OGATEB,SBLOCK::B(F)
        • P(j);::QAR1(H),XP(j)
      • Refutation
        • R(k);XQ(H)
    • Try
      • Q(H);
      • Threat
        • QAR1(H)
      • Vars
        • P(j);::QAR1(H),XP(j)
      • Refutation
        • P(i);N_SPINS(f)
  • Actual
    • Q(H);CHECK,XP(j)
    • Vars
      • K(e);P-FLIGHT::R(C)+B(D),DCHECK,XP(b)
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