MESON Chess Problem Database

Problem Display
PID: 229044 (4bq2/Q7/3b2R1/1pP1rpNp/1p1k1N2/1B6/2PP1P1K/6B1 w - - 0 1)

Levman, Semyon Semyonovich

3rd HM., 64 Shakhmatnoe obozrenie, 1926

4bq2/Q7/3b2R1/1pP1rpNp/1p1k1N2/1B6/2PP1P1K/6B1

#2

11 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Sf3#
    • 1...Bxc5
      • 2.Qa1#
  • Tries
    • 1.Rxd6+?
      • 1...Rd5
        • 2.Rxd5#
      • 1...Qxd6!
    • 1.c6+?
      • 1...Bc5
        • 2.Qa1#
      • 1...Rc5!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Qa1#
      • 1...Re1+
        • 2.cxd6#
      • 1...Re2+
        • 2.cxd6#
      • 1...Re3+
        • 2.cxd6#
      • 1...Re4+
        • 2.cxd6#
      • 1...Rxc5+
        • 2.f4#
      • 1...Rd5+
        • 2.f4#
      • 1...Re6+
        • 2.cxd6#
      • 1...Re7+
        • 2.Rxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • R(d);P_PINS(G),SBLOCK::S(I)
    • B(g);P_SPINB(g),SBLOCK,XP(H)::QAB(K)
  • Tries
    • Try
      • R(J);CHECK,XB(g)
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::R1(J),XR(d)
      • Refutation
        • Q(i);XR(J)
    • Try
      • P(H);CHECK
      • Vars
        • B(g);P_SPINB(g),SBLOCK::QAB(K)
      • Refutation
        • R(d);P_PINS(G),P_SPINR(d)
  • Actual
    • S(G);
    • Threat
      • QAB(K)
    • Vars
      • R(d);CHECK,N_GUARD::QAB(K)+P(H),XB(g)
      • R(d);CHECK,N_GUARD,P_PINP(D)::QAB(K)+P(H),XB(g)
      • R(d);CHECK,N_GUARD,P_SPINR(d),XP(H)::B(A)+P(D)
      • R(d);CHECK,N_GUARD::B(A)+P(D)
      • R(d);CHECK,N_GUARD,S_CUTQ(i)::R(J),XB(g)
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Developed and maintained by Brian Stephenson.
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