MESON Chess Problem Database

Problem Display
PID: 173105 (8/p2n1rB1/BQbKR2q/2N1n1p1/1Ppk2pN/1P1pRr2/3P3b/8 w - - 0 1)

Barulin, Mikhail Mikhailovich

5th HM., Shakhmaty, 1927

8/p2n1rB1/BQbKR2q/2N1n1p1/1Ppk2pN/1P1pRr2/3P3b/8

#2

11 + 13

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe6+
      • 2.Sxe6#
    • 1...Ba4
      • 2.Re4#
    • 1...Be4
      • 2.Rxe4#
    • 1...Bb5
      • 2.Re4#
    • 1...Sxc5
      • 2.Qxc5#
    • 1...cxb3
      • 2.Sxb3#
  • Tries
    • 1.Rg6?
      • threat
        • 2.Se6#
      • 1...Sxc5
        • 2.Qxc5#
      • 1...Rxe3!
    • 1.Rxh6?
      • threat
        • 2.Se6#
      • 1...Sxc5
        • 2.Qxc5#
      • 1...Rxe3!
    • 1.Qxc6?
      • threat
        • 2.Re4#
        • 2.Qe4#
        • 2.Qd5#
      • 1...Qxe6+
        • 2.Sxe6#
      • 1...Rxe3
        • 2.Qd5#
      • 1...Sxc5
        • 2.Qd5#
        • 2.Qxc5#
      • 1...Qg6
        • 2.Qd5#
      • 1...Qh7
        • 2.Qd5#
      • 1...R3f4
        • 2.Qd5#
      • 1...R7f4
        • 2.Qd5#
      • 1...Sb6
        • 2.Re4#
        • 2.Qe4#
      • 1...Sf6!
    • 1.bxc4?
      • threat
        • 2.Sb3#
      • 1...Qxe6+
        • 2.Sxe6#
      • 1...Sxc5
        • 2.Qxc5#
      • 1...Bb5
        • 2.Re4#
      • 1...Rxe3!
  • Keys
    • 1.Rf6!
      • threat
        • 2.Se6#
      • 1...Sg6+
        • 2.Rf4#
      • 1...Rxe3
        • 2.Sf5#
      • 1...Sxc5
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(j);CHECK,XR(J)::QAB(H)+S(F),DCHECK,XQ(j)
    • B(i);N_GUARD::R1(C)
    • B(i);N_GUARD::R1(C),XB(i)
    • S(l);N_SPINS(g),OGATE,P_SPINS(l),XS(F)::QAB1(H),XS(l)
    • P(d);XP(B)::QAB(H)+S(F),DCHECK,XP(d)
  • Tries
    • Try
      • R(J);
      • Threat
        • QAB(H)+S(F),DCHECK
      • Vars
        • S(l);N_SPINS(g),OGATE,P_SPINS(l),XS(F)::QAB1(H),XS(l)
      • Refutation
        • R(c);XR(C)
    • Try
      • R(J);N_SPINR(J),XQ(j)
      • Threat
        • QAB(H)+S(F),DCHECK
      • Vars
        • S(l);N_SPINS(g),OGATE,P_SPINS(l),XS(F)::QAB1(H),XS(l)
      • Refutation
        • R(c);XR(C)
    • Try
      • Q(H);XB(i)
      • Threat
        • DUALS(3)
      • Vars
        • Q(j);CHECK,XR(J)::S(F),XQ(j)
        • R(c);XR(C)::QAR1(H)
        • Q(j);::QAR1(H)
        • Q(j);N_PINR(J)::QAR1(H)
        • R(c);::QAR1(H)
        • R(m);::QAR1(H)
      • Refutation
        • S(l);N_PINR(J),N_SPINS(g)
    • Try
      • P(B);XP(d)
      • Threat
        • QAB(H)+S(F),DCHECK
      • Vars
        • Q(j);CHECK,XR(J)::QAB(H)+S(F),DCHECK,XQ(j)
        • S(l);N_SPINS(g),OGATE,P_SPINS(l),XS(F)::QAB1(H),XS(l)
        • B(i);N_GUARD::R1(C)
      • Refutation
        • R(c);XR(C)
  • Actual
    • R(J);N_PINS(g)
    • Threat
      • QAB(H)+S(F),DCHECK
    • Vars
      • S(g);CHECK,N_PINR(J)::B(K)+R(J),DCHECK
      • R(c);N_GUARD,XR(C)::S(E)
      • S(l);OGATE,P_SPINS(l),XS(F)::QAB1(H),XS(l)
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