MESON Chess Problem Database

Problem Display
PID: 235454 (1b1R3K/P1P2N2/5RP1/1B1P4/4kp1p/pN1prn2/6q1/2B2brQ w - - 0 1)

Pituk, Alexander

Freie Presse, 2000

1b1R3K/P1P2N2/5RP1/1B1P4/4kp1p/pN1prn2/6q1/2B2brQ

#2

12 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Rxf4#
    • 1...Re2
      • 2.Rxf4#
    • 1...Sd4
      • 2.Sd2#
    • 1...Se5
      • 2.Sg5#
  • Tries
    • 1.Sd6+?
      • 1...Ke5
        • 2.Rf5#
      • 1...Kxd5!
    • 1.Re8+?
      • 1...Kxd5
        • 2.Rd6#
        • 2.a8Q#
        • 2.a8B#
      • 1...Se5!
    • 1.a8B?
      • threat
        • 2.d6#
      • 1...Sd4
        • 2.Sd2#
      • 1...Se5
        • 2.Sg5#
      • 1...Qc2
        • 2.Re8#
      • 1...Qg5!
    • 1.cxb8Q?
      • threat
        • 2.Rxf4#
        • 2.Qxf4#
      • 1...Se5
        • 2.Sg5#
      • 1...Qb2
        • 2.Qxf4#
      • 1...Qh2
        • 2.Qe5#
      • 1...Qg3
        • 2.Qe5#
      • 1...Qg4
        • 2.Qe5#
      • 1...Qg5!
  • Keys
    • 1.a8Q!
      • threat
        • 2.d6#
      • 1...Sd4
        • 2.Sd2#
      • 1...Se5
        • 2.Sg5#
      • 1...Qc2
        • 2.Re8#
      • 1...Qg5
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(f);::R1(F),XP(i)
    • S(g);N_GUARD,P_SPINQ(c),SBLOCK::S(C)
    • S(g);N_GUARD,P_SPINQ(c),SBLOCK::S(J)
  • Tries
    • Try
      • S(J);CHECK
      • Vars
        • K(h);P-FLIGHT::R1(F)
      • Refutation
        • K(h);S_FLIGHT,XP(E)
    • Try
      • R(K);CHECK
      • Refutation
        • S(g);P_SPINQ(c),P_SPINS(g)
    • Try
      • P(H);
      • Threat
        • B(H)+P(E)
      • Vars
        • S(g);N_GUARD,P_SPINQ(c),SBLOCK::S(C)
        • S(g);N_GUARD,P_SPINQ(c),SBLOCK::S(J)
        • Q(c);P_SPINS(g)::R(K)
      • Refutation
        • Q(c);P_SPINS(g)
    • Try
      • P(I);XB(k)
      • Threat
        • DUALS(2)
      • Vars
        • S(g);N_GUARD,P_SPINQ(c)::S(J)
        • Q(c);P_PINR(F),P_SPINS(g)::QAR1(I),XP(i)
        • Q(c);P_SPINS(g)::QAR1(I)
      • Refutation
        • Q(c);P_SPINS(g)
  • Actual
    • P(H);
    • Threat
      • QAB(H)+P(E)
    • Vars
      • S(g);N_GUARD,P_SPINQ(c),SBLOCK::S(C)
      • S(g);N_GUARD,P_SPINQ(c),SBLOCK::S(J)
      • Q(c);P_SPINS(g)::R(K)
      • Q(c);P_SPINS(g)::QAR(H)
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