MESON Chess Problem Database

Problem Display
PID: 135300 (qr1B2n1/1BQ5/4p3/3PrP2/1P1Nkp1R/5R1n/1p2N1P1/1b2K3 w - - 0 1)

Surkov, Ruslan Albertovich

2nd Prize, All-Union-80 JT, 2006

qr1B2n1/1BQ5/4p3/3PrP2/1P1Nkp1R/5R1n/1p2N1P1/1b2K3

#2

12 + 10

23 Die Schwalbe 2009
15323 FIDE Album (2004-2006) 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Ba2
      • 2.Qc2#
    • 1...Bc2
      • 2.Qxc2#
    • 1...Sg1
      • 2.Rhxf4#
    • 1...Sf2
      • 2.Rhxf4#
    • 1...Sg5
      • 2.Rhxf4#
  • Tries
    • 1.Bf6?
      • threat
        • 2.Qxe5#
      • 1...Rxd5
        • 2.Sc3#
        • 2.Sg3#
        • 2.Qe5#
      • 1...Rxf5
        • 2.Sc3#
        • 2.Sg3#
      • 1...Sxf6!
    • 1.Rfxf4+?
      • 1...Kd3
        • 2.Qc3#
      • 1...Ke3
        • 2.Rf3#
        • 2.Rxh3#
      • 1...Sxf4!
    • 1.Qb6?
      • threat
        • 2.Sc3#
        • 2.Sg3#
      • 1...Qxb7
        • 2.Sc3#
      • 1...Rxd5
        • 2.Qxe6#
      • 1...Rxb7
        • 2.Sc3#
      • 1...Qa3
        • 2.Sg3#
      • 1...Rc8
        • 2.Sg3#
      • 1...Rxf5!
    • 1.Qc4?
      • threat
        • 2.Sc3#
        • 2.Sg3#
      • 1...Rxf5
        • 2.Sc6#
      • 1...Qa3
        • 2.Sg3#
      • 1...Rxd5!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Qxe5#
      • 1...Kxd5
        • 2.Se7#
      • 1...Kxf5
        • 2.Qh7#
      • 1...Rxd5
        • 2.Sg3#
      • 1...Rxf5
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • B(a);N_GUARD::QAB(K)
    • B(a);N_GUARD::QAB(K),XB(a)
    • S(c);N_GUARD::R1(G),XP(e)
  • Tries
    • Try
      • B(L);
      • Threat
        • QAR1(K),XR(f)
      • Refutation
        • S(j);XB(L)
    • Try
      • R(D);CHECK,XP(e)
      • Vars
        • K(d);P_PINS(B),S_FLIGHT::QAR1(K)
      • Refutation
        • S(c);P_SPINS(c),XR(D)
    • Try
      • Q(K);
      • Threat
        • DUALS(2)
      • Vars
        • Q(h);XB(J)::S(B)
        • R(f);OGATEB,P_SPINR(f),XP(H)::QAR2(K),XP(g)
        • R(i);XB(J)::S(B)
        • Q(h);::S(B)
        • R(i);::S(B)
      • Refutation
        • R(f);XP(I)
    • Try
      • Q(K);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);SBLOCK,XP(I)::QAR(K)+S(F)
        • Q(h);::S(B)
      • Refutation
        • R(f);P_SPINR(f),XP(H)
  • Actual
    • S(F);
    • Threat
      • QAR1(K),XR(f)
    • Vars
      • K(d);N_SPINP(e),P_PINS(B),S_FLIGHT,XP(H)::B(J)+S(F),DCHECK
      • K(d);OGATEB,P_PINS(B),S_FLIGHT,XP(I)::QAB(K)
      • R(f);SBLOCK,XP(H)::S(B)
      • R(f);SBLOCK,XP(I)::S(B)
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