MESON Chess Problem Database

Problem Display
PID: 103139 (6K1/2p5/np1QB1pb/2pP4/P1k1p1r1/R6r/2P1N3/1qR1BN2 w - - 0 1)

Maleika, Gerhard

Contromossa Scacchi, 1981

6K1/2p5/np1QB1pb/2pP4/P1k1p1r1/R6r/2P1N3/1qR1BN2

#2

11 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.cxd3#
    • 1...c6
      • 2.dxc6#
  • Tries
    • 1.Qg3?
      • threat
        • 2.d6#
      • 1...Rh5
        • 2.Qc3#
      • 1...Rg5
        • 2.Se3#
      • 1...Sb4
        • 2.Rc3#
      • 1...Bd2!
    • 1.Qf4?
      • threat
        • 2.d6#
      • 1...Rd3
        • 2.cxd3#
      • 1...Rh5
        • 2.Se3#
      • 1...Rg5
        • 2.Qxe4#
      • 1...Sb4
        • 2.Sd2#
      • 1...Rc3!
  • Keys
    • 1.Qxb6!
      • threat
        • 2.d6#
      • 1...Rd3
        • 2.cxd3#
      • 1...Rh5
        • 2.Rc3#
      • 1...Rg5
        • 2.Sd2#
      • 1...Sb4
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(b);OGATE::R(A)+P(D)DCHECK,XR(b)
    • P(k);OGATE::B(J)+P(H),XP(k)
  • Tries
    • Try
      • Q(I);
      • Threat
        • B(J)+P(H)
      • Vars
        • R(b);N_GUARD::QAR1(I)
        • R(e);S_CUTB(j)::S(C)
        • S(g);SBLOCK::R1(F)
      • Refutation
        • B(j);
    • Try
      • Q(I);P_PINP(d)
      • Threat
        • B(J)+P(H)
      • Vars
        • R(b);OGATE::R(A)+P(D)DCHECK,XR(b)
        • R(b);N_GUARD::S(C)
        • R(e);N_GUARD::QAR2(I),XP(d)
        • S(g);SBLOCK::S(C)
      • Refutation
        • R(b);
  • Actual
    • Q(I);XP(h)
    • Threat
      • B(J)+P(H)
    • Vars
      • R(b);OGATE::R(A)+P(D)DCHECK,XR(b)
      • R(b);N_GUARD::R1(F)
      • R(e);S_CUTB(j)::S(C)
      • S(g);S_CUTQ(a)::QAB1(I)
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