MESON Chess Problem Database

Problem Display
PID: 180300 (3B4/3pR3/8/1PR2N2/kr2QK2/p2p4/1pPN2p1/8 w - - 0 1)

Lider, Valentin Viktorovich

Comm., Europe Echecs, 1983

3B4/3pR3/8/1PR2N2/kr2QK2/p2p4/1pPN2p1/8

#2

9 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.Qxc4#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Rxe4+
      • 2.Rxe4#
    • 1...d5
      • 2.Ra7#
    • 1...d6
      • 2.Ra7#
  • Tries
    • 1.Kf3?
      • threat
        • 2.Qa8#
      • 1...Rxe4
        • 2.Rxe4#
      • 1...Rc4
        • 2.Qxc4#
      • 1...Rd4
        • 2.Qxd4#
      • 1...d5
        • 2.Ra7#
      • 1...g1S+!
    • 1.Sc4?
      • threat
        • 2.Qa8#
      • 1...Rxc4
        • 2.Qxc4#
      • 1...Rxb5
        • 2.Sxb2#
      • 1...Rb3
        • 2.Sxb2#
      • 1...d5
        • 2.Ra7#
      • 1...dxc2!
    • 1.Rxd7?
      • threat
        • 2.Ra7#
      • 1...Rc4
        • 2.Qxc4#
      • 1...Rd4
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Rxe4+!
    • 1.c4?
      • threat
        • 2.Qa8#
      • 1...Rxc4
        • 2.Qxc4#
      • 1...Rxb5
        • 2.cxb5#
      • 1...d5
        • 2.Ra7#
      • 1...Rb3!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qa8#
      • 1...Rxd4
        • 2.Qxd4#
      • 1...Rxb5
        • 2.Sxb5#
      • 1...Rb3
        • 2.S4xb3#
      • 1...Rc4
        • 2.Rxc4#
      • 1...d5
        • 2.Ra7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(f);::QAR2(C),XR(f)
    • R(f);::QAR(C),XR(f)
    • R(f);CHECK,N_SPINR(f),OGATE,XQ(C)::R(H),XR(f)
    • P(g);OGATE::R(H)
  • Tries
    • Try
      • K(D);N_SPINQ(C),P-FLIGHT
      • Threat
        • QAR(C)
      • Vars
        • R(f);N_SPINR(f),OGATE,XQ(C)::R(H),XR(f)
        • R(f);OGATEB::QAR2(C),XR(f)
        • R(f);OGATEB::QAR(C),XR(f)
        • P(g);OGATE::R(H)
      • Refutation
        • P(b);CHECK
    • Try
      • S(B);N_PINR(f),N_SPINQ(C)
      • Threat
        • QAR(C)
      • Vars
        • R(f);OGATE,P_PINQ(C),P_SPINR(f),XS(B)::QAR2(C),XR(f)
        • R(f);XP(E)::QAR(C)+S(B),DCHECK,XP(a)
        • R(f);::QAR(C)+S(B),DCHECK,XP(a)
        • P(g);OGATE::R(H)
      • Refutation
        • P(d);XP(A)
    • Try
      • R(H);XP(g)
      • Threat
        • R(H)
      • Vars
        • R(f);::QAR2(C),XR(f)
      • Refutation
        • R(f);CHECK,N_SPINR(f),XQ(C)
    • Try
      • P(A);N_PINR(f),N_SPINQ(C)
      • Threat
        • QAR(C)
      • Vars
        • R(f);OGATE,P_PINQ(C),P_SPINR(f),XP(A)::QAR2(C),XR(f)
        • R(f);OGATE,XP(E)::QAR(C)+P(A),XR(f)
        • P(g);OGATE::R(H)
      • Refutation
        • R(f);
  • Actual
    • S(G);N_PINR(f),N_SPINQ(C)
    • Threat
      • QAR(C)
    • Vars
      • R(f);OGATE,P_PINQ(C),P_SPINR(f),XS(G)::QAR(C),XR(f)
      • R(f);XP(E)::QAR(C)+S(G),XR(f)
      • R(f);::QAR(C)+S(G),XR(f)
      • R(f);OGATEB::R(F),XR(f)
      • P(g);OGATE::R(H)
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