MESON Chess Problem Database

Problem Display
PID: 85479 (8/8/3pn2R/R1prkrQ1/4p3/8/BKbPP3/4B3 w - - 0 1)

Petrov, Evgeny Aleksandrovich

Northwest Chess, 1976

8/8/3pn2R/R1prkrQ1/4p3/8/BKbPP3/4B3

#2

8 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.Rxe6#
    • 1...Sd4
      • 2.Bg3#
  • Tries
    • 1.Bg3+?
      • 1...Kd4
        • 2.Qe3#
      • 1...Sf4!
    • 1.Rxe6+?
      • 1...Kd4
        • 2.Qe3#
      • 1...Kxe6!
    • 1.Qf6+?
      • 1...Kf4
        • 2.Rh4#
      • 1...Rxf6!
    • 1.Qxf5+?
      • 1...Kd4
        • 2.Qxd5#
      • 1...Kxf5!
    • 1.Qg7+?
      • 1...Kf4
        • 2.Bg3#
        • 2.Rh4#
        • 2.Qg3#
      • 1...Rf6
        • 2.Qxf6#
      • 1...Sxg7!
  • Keys
    • 1.d4+!
      • 1...Kxd4
        • 2.Bc3#
      • 1...Rxd4
        • 2.Rxe6#
      • 1...Sxd4
        • 2.Bg3#
      • 1...cxd4
        • 2.Rxd5#
      • 1...exd4 ep
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(d);P_SPINP(c),SBLOCK::R1(H),XS(h)
    • S(h);N_GUARD,SBLOCK::B(A)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • K(e);N_SPINR(f),S_FLIGHT::QAB1(G)
      • Refutation
        • S(h);P_SPINS(h)
    • Try
      • R(H);CHECK,XS(h)
      • Vars
        • K(e);N_SPINR(f),S_FLIGHT::QAB1(G)
      • Refutation
        • K(e);N_SPINR(f),P-FLIGHT,P_SPINR(d),XR(H)
    • Try
      • Q(G);CHECK,N_PINR(f)
      • Vars
        • K(e);P_SPINR(f),S_FLIGHT::R(H)
      • Refutation
        • R(f);XQ(G)
    • Try
      • Q(G);CHECK,XR(f)
      • Vars
        • K(e);OGATE,S_FLIGHT::QAR1(G),XR(d)
      • Refutation
        • K(e);P-FLIGHT,XQ(G)
    • Try
      • Q(G);CHECK,N_PINR(f)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAB1(G),XR(f)
      • Refutation
        • S(h);XQ(G)
  • Actual
    • P(D);CHECK
    • Vars
      • K(e);N_SPINR(f),S_FLIGHT,XP(D)::B(A)
      • R(d);P_SPINP(c),SBLOCK,XP(D)::R1(H),XS(h)
      • S(h);SBLOCK,XP(D)::B(A)
      • P(c);N_SPINR(f),OGATE,P_SPINR(d),XP(D)::R1(F),XR(d)
      • P(b);EP,S_CUTP(c),S_CUTR(d),S_CUTS(h),XP(D)::QAR2(G)
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