MESON Chess Problem Database

Problem Display
PID: 86798 (8/2p5/pNPp4/rbP2K2/pN1k4/B2n4/5P2/b1QR4 w - - 0 1)

Pilkarenko, CU

US Problem Bulletin, 1990

8/2p5/pNPp4/rbP2K2/pN1k4/B2n4/5P2/b1QR4

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bb2
      • 2.Bxb2#
    • 1...Bc3
      • 2.Sc2#
      • 2.Qe3#
    • 1...Bc4
      • 2.Qxc4#
    • 1...Bxc6
      • 2.Sxc6#
      • 2.Rxd3#
      • 2.Qc4#
    • 1...dxc5
      • 2.Qxa1#
  • Tries
    • 1.Sa2?
      • threat
        • 2.Qe3#
        • 2.Qf4#
        • 2.Qxa1#
      • 1...Bxc6
        • 2.Qe3#
        • 2.Qxa1#
        • 2.Qc4#
      • 1...Bb2
        • 2.Bxb2#
        • 2.Qxb2#
        • 2.Qe3#
        • 2.Qf4#
      • 1...Bc3
        • 2.Qe3#
        • 2.Qf4#
        • 2.Qxc3#
      • 1...cxb6!
    • 1.S4d5?
      • threat
        • 2.Qe3#
        • 2.Qf4#
        • 2.Qxa1#
      • 1...Bb2
        • 2.Bxb2#
        • 2.Qxb2#
        • 2.Qe3#
        • 2.Qf4#
      • 1...Bc3
        • 2.Qe3#
        • 2.Qf4#
        • 2.Qxc3#
      • 1...cxb6!
    • 1.Sxa6?
      • threat
        • 2.Qxa1#
      • 1...Bb2
        • 2.Bxb2#
        • 2.Qxb2#
      • 1...Bc3
        • 2.Qe3#
        • 2.Qf4#
      • 1...cxb6!
    • 1.Sxa4?
      • threat
        • 2.Qf4#
      • 1...Bxa4
        • 2.Rxd3#
      • 1...Bxc6
        • 2.Rxd3#
      • 1...Rxa4!
    • 1.Sd7?
      • 1...Bxc6
        • 2.Rxd3#
      • 1...dxc5
        • 2.Qxc5#
      • 1...Bc3
        • 2.Qf4#
      • 1...Bb2
        • 2.Bxb2#
      • 1...Bc4
        • 2.Qxa1#
      • 1...d5!
    • 1.Qf4+?
      • 1...Kxc5
        • 2.Sd7#
      • 1...Kc3!
    • 1.Qc3+?
      • 1...Bxc3
        • 2.Sc2#
      • 1...Kxc3!
  • Keys
    • 1.S6d5!
      • 1...Bxc6
        • 2.Rxd3#
      • 1...dxc5
        • 2.Qf4#
      • 1...Bc3
        • 2.Qxc3#
      • 1...Bc4
        • 2.Qe3#
      • 1...Bb2
        • 2.Bxb2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::B(D),XB(a)
    • B(f);N_GUARD,P_PINP(F)::QAR1(A),XB(f)
    • P(h);SBLOCK,XP(F)::QAB(A),XB(a)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(3)
      • Refutation
        • P(i);XS(H)
    • Try
      • S(E);
      • Threat
        • DUALS(3)
      • Refutation
        • P(i);XS(H)
    • Try
      • S(E);XP(g)
      • Threat
        • QAB(A),XB(a)
      • Refutation
        • P(i);XS(H)
    • Try
      • S(H);XP(c)
      • Threat
        • QAR2(A)
      • Vars
        • B(f);N_GUARD,P_PINP(F),XS(H)::R1(B),XS(b)
        • B(f);N_GUARD,P_PINP(F),XP(I)::R1(B),XS(b)
      • Refutation
        • R(e);XS(H)
    • Try
      • S(H);
      • Vars
        • B(f);N_GUARD,P_PINP(F),XP(I)::R1(B),XS(b)
        • P(h);OGATE,XP(F)::QAB1(A),XP(h)
        • B(a);SBLOCK::QAR2(A)
        • B(a);N_GUARD::B(D),XB(a)
        • B(f);P_PINP(F),SBLOCK::QAB(A),XB(a)
      • Refutation
        • P(h);
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);N_SPINS(b),S_FLIGHT,XP(F)::S(H)
      • Refutation
        • K(d);N_SPINS(b),S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • B(a);SBLOCK,XQ(A)::S(E)
      • Refutation
        • K(d);N_SPINS(b),S_FLIGHT,XQ(A)
  • Actual
    • S(H);
    • Vars
      • B(f);N_GUARD,XP(I)::R1(B),XS(b)
      • P(h);SBLOCK,XP(F)::QAR2(A)
      • B(a);N_GUARD::QAB1(A),XB(a)
      • B(f);SBLOCK::QAB1(A)
      • B(a);N_GUARD::B(D),XB(a)
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