MESON Chess Problem Database

Problem Display
PID: 91439 (2R3B1/BQb2r2/3p2b1/p3p3/P1P2P2/3kP2N/N1R5/5K2 w - - 0 1)

Permyakov, Evgeni Nikolaevich

Probleemblad, 1987

2R3B1/BQb2r2/3p2b1/p3p3/P1P2P2/3kP2N/N1R5/5K2

#2

12 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Qb3#
    • 1...e4
      • 2.Qb3#
  • Tries
    • 1.Rd2+?
      • 1...Kxc4
        • 2.Rxc7#
        • 2.Qd5#
        • 2.Qb5#
      • 1...Kxd2!
    • 1.Re2?
      • threat
        • 2.Qd5#
      • 1...Kxc4
        • 2.Qb5#
      • 1...d5
        • 2.Qxd5#
      • 1...Be4
        • 2.Qb3#
      • 1...Bb6
        • 2.Sf2#
      • 1...Rxf4+!
    • 1.Rf2?
      • threat
        • 2.Qd5#
      • 1...Kxc4
        • 2.Qb5#
      • 1...Rxf4
        • 2.Qb1#
      • 1...d5
        • 2.Qxd5#
      • 1...Be4
        • 2.Qb3#
      • 1...Bb6!
    • 1.Qg2?
      • threat
        • 2.Sc1#
        • 2.Rc3#
      • 1...Bb6
        • 2.Rc3#
      • 1...Rxf4+!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Sf2#
      • 1...Rxf4+
        • 2.Rf2#
      • 1...Ke4
        • 2.Rf2#
      • 1...Bb6
        • 2.Re2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(e);SBLOCK::QAR2(J)
    • P(c);SBLOCK::QAR2(J)
  • Tries
    • Try
      • R(C);CHECK
      • Refutation
        • K(a);P-FLIGHT,XR(C)
    • Try
      • R(C);
      • Threat
        • QAR2(J)
      • Vars
        • K(a);OGATEB,P_SPINB(f),P_SPINR(g),S_FLIGHT,XP(G)::QAB1(J)
        • P(d);::QAR2(J),XP(d)
        • B(e);SBLOCK::QAR2(J)
        • B(f);::S(E)
      • Refutation
        • R(g);CHECK,XP(H)
    • Try
      • R(C);N_SPINP(H)
      • Threat
        • QAR2(J)
      • Vars
        • K(a);OGATEB,P_SPINB(f),P_SPINR(g),S_FLIGHT,XP(G)::QAB1(J)
        • R(g);P_PINR(C),XP(H)::QAB(J)
        • P(d);::QAR2(J),XP(d)
        • B(e);SBLOCK::QAR2(J)
      • Refutation
        • B(f);
    • Try
      • Q(J);
      • Threat
        • DUALS(2)
      • Vars
        • B(f);::R1(C)
      • Refutation
        • R(g);CHECK,XP(H)
  • Actual
    • Q(J);
    • Threat
      • S(E)
    • Vars
      • R(g);CHECK,XP(H)::QAB(J)+R(C)
      • K(a);S_FLIGHT::QAB(J)+R(C)
      • B(f);::QAB(J)+R(C)
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